---
product_id: 412551126
title: "K1 Quiet Rock Tumbler Kit for Adults, Kids & Families | Reliable 2.5Lb Rotary Rock Polisher, Thick Rubber Barrel, 3 Speeds, 9-Day Timer, Memory Function, Complete Gem Polishing Kit"
brand: "komestone"
price: "€ 243.31"
currency: EUR
in_stock: true
reviews_count: 13
category: "Kome Stone"
url: https://www.desertcart.hr/products/412551126-k1-quiet-rock-tumbler-kit-for-adults-kids-and-families
store_origin: HR
region: Croatia
---

# 9-day programmable timer 75% noise reduction 2.5 lb tumbling capacity K1 Quiet Rock Tumbler Kit for Adults, Kids & Families | Reliable 2.5Lb Rotary Rock Polisher, Thick Rubber Barrel, 3 Speeds, 9-Day Timer, Memory Function, Complete Gem Polishing Kit

**Brand:** komestone
**Price:** € 243.31
**Availability:** ✅ In Stock

## Summary

> 🪨 Transform Rough Rocks into Polished Treasures—Quietly, Smartly, Effortlessly!

## Quick Answers

- **What is this?** K1 Quiet Rock Tumbler Kit for Adults, Kids & Families | Reliable 2.5Lb Rotary Rock Polisher, Thick Rubber Barrel, 3 Speeds, 9-Day Timer, Memory Function, Complete Gem Polishing Kit by komestone
- **How much does it cost?** € 243.31 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/412551126-k1-quiet-rock-tumbler-kit-for-adults-kids-and-families)

## Best For

- komestone enthusiasts

## Why This Product

- Trusted komestone brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Complete All-In-One Kit:** Everything you need to start polishing immediately—rocks, grits, ceramic media, jewelry findings, and tools included for a seamless experience.
- • **Whisper-Quiet Operation:** Enjoy up to 75% less noise with a thick rubber barrel—perfect for home, workshop, or family spaces without disruption.
- • **Generous 2.5 lb Capacity:** Polish 2.5× more stones per batch than standard kits—ideal for serious hobbyists and families ready to level up their rock game.
- • **Built to Last & Supported:** Replaceable parts and US-based customer support ensure your K1 tumbler stays a permanent, reliable part of your creative journey.
- • **Precision Digital Timer & Memory:** Set and forget with a 9-day adjustable timer, pause/resume function, and memory recall after power interruptions for flawless polishing.

## Overview

The KomeStone K1 Quiet Rock Tumbler Kit is a top-rated, professional-grade polishing machine trusted by over 3 million hobbyists. Featuring a 2.5 lb thick rubber barrel that reduces noise by 75%, a smart 9-day digital timer with pause and memory functions, and a complete kit with all necessary grits and accessories, it’s designed for adults, kids, and families to easily create stunning polished stones. Durable, supported, and backed by a 90-day money-back guarantee and 1-year warranty, the K1 is the ultimate tool for geology enthusiasts and creative hobbyists alike.

## Description

Buy KomeStone K1 Quiet Rock Tumbler Kit for Adults, Kids & Families | Reliable 2.5Lb Rotary Rock Polisher, Thick Rubber Barrel, 3 Speeds, 9-Day Timer, Memory Function, Complete Gem Polishing Kit: Tumbling Media - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Nerdy excited!!! LOVE THIS TUMBLER! - I ordered this on impulse as my daughter had a national geographic tumbling kit. That one is mediocre at best, however I've always wanted to have one. So, I bought the pro K-1 brushless, and I'm impressed with the rubber basin and how airtight sealed it is. Works incredibly well! Functions are simple to use. Great storage capacity also. The instructions are detailed, easy to understand, easy to follow through. They provide two extra pulley belts for the machine. A screwdriver to pop the lid, as the lid recesses into the rubber basin. There's another lid that goes over that with a butterfly style handle/screw. I have mine set up in my shed, as it's much quieter than the previous rock tumbler I experimented with. This one is awesome because it has a built-in timer that sets how many days you would like to tumble the rocks. The instructions have guidelines and suggestions. And then it also has the speed ratio. There's a pause/play button, so if at any time you want to check on the progress of your tumbling, you may do so and press pause and not lose your day counts by powering it off. This kit comes with grits, step 1- thru 4. They're one time use. KomeStone has grit kits available to purchase and reasonably priced for future tumbling sessions. I'm obviously on day 1, but I'm excited to check back in a few days. Not sure if desertcart allows for video updates or anything of that nature, but I'll try if it allows.
Review: Rock Tumbler: A Gem of a Machine (Mostly) - Alright, rock enthusiasts and aspiring geologists, gather 'round! I recently acquired the KomeStone K1 Pro Professional Cutting-Edge Rock Tumbler, hoping to transform my collection of backyard pebbles into sparkling treasures worthy of a museum (or at least, my mantelpiece). This machine is, indeed, cutting-edge... or at least, it cuts through the rough edges of rocks with impressive dedication. It's like a tiny, geological spa for your stones, giving them the smooth, polished glow they've always dreamed of. My rocks are now so shiny, I'm pretty sure they're starting to develop egos. The "professional" part? Well, it certainly sounds important, and it feels pretty robust. It hums along, doing its thing, turning mundane rocks into mini works of art. I've spent an embarrassing amount of time just watching it spin, mesmerized by the slow, steady transformation. It's surprisingly therapeutic, almost like a lava lamp, but with more potential for bling. My only minor quibble is that I now have an overwhelming urge to collect all the rocks. Every walk is an archaeological dig, every pebble a potential masterpiece. My pockets are perpetually full, and my family is starting to eye me suspiciously when I bring home yet another bag of "future gems." This tumbler is so effective, it's turning me into a rock hoarder. So, if you're looking to polish your pebbles (and perhaps your patience), the KomeStone K1 Pro is a solid investment. Just be warned: you might develop a serious case of "rock fever." It's a gem of a machine, and I'm totally rocking my new hobby!

## Features

- Trusted by 3,000,000+ Hobbyists — Ranked #1 by Independent Review Publications — Named the top rock tumbler by NBC's Today, BestReviews, BuyerGuide, and more (2022–2026) — recognized for performance, reliability, and value. With over 3,000,000 orders shipped across KomeStone's lineup as of July 2026, it's the trusted choice for adults, hobbyists, and families who want a dependable tumbler that delivers real results.
- Designed for Adults, Kids, Teens, and Families — Built for anyone who wants a quiet, reliable tumbler for everyday home use. The 2.5 lb capacity makes it the ideal first step up from a standard 1 lb beginner kit — and with dedicated US-based support and replaceable components, the K1 is a machine adults and hobbyists trust, kids and teens can start on, and beginners can genuinely learn from.
- 75% Quieter Rubber Barrel with 2.5 lb Capacity — Process agates, jasper, quartz, gemstones, sea glass, and most popular tumbling stones. The 2.5 lb barrel gives you 2.5× the capacity of a standard 1 lb barrel, letting you polish more stones per batch. Its thick rubber construction cushions rock impact and reduces noise by up to 75% compared to plastic barrels — comparable to a running dishwasher — for a comfortable tumbling experience in living rooms, garages, workshops, and hobby spaces.
- Smart Controls with Pause, Resume and Settings Memory — Choose from 3 speed settings and program each polishing stage on the clear LCD screen with the adjustable 9-day digital timer. Pause the tumbler to check your stones, then resume without restarting your settings. Automatic shutoff stops the cycle when complete, while the memory function restores your settings after any power interruption — the perfect, hassle-free control system for beginners and hobbyists alike. Set your stage, walk away, and come back to perfectly tumbled stones.
- Complete Rock Tumbler Kit — Ready to Unbox and Start on Day One — Includes the K1 tumbler, a thick 2.5 lb rubber barrel, 1 lb of rough rocks in 9 varieties sourced from around the world, four bags of 60/120/150/1200 polishing grit, ceramic tumbling media, a mesh strainer, jewelry findings, 3 drive belts, and a full-color illustrated guide. No additional purchases needed — everything required to begin your first polishing batch is already in the box.
- Step-by-Step Guidance for Every Level — The included full-color guidebook covers everything from initial setup to finishing your first batch — with detailed polishing techniques, troubleshooting steps, and practical tips like adding soapy water during polishing stages. Our US-based support team is also available anytime for polishing questions or machine help. Together, the comprehensive guidance and dedicated support help adults, beginners, teens, and families make real progress — from rough stones to finished keepsakes. Makes a complete geology or STEM gift for rock enthusiasts of all ages.
- Replaceable Key Parts for Long-Term Ownership — Core components are designed to be individually replaceable, not discarded. The motor, control panel, drive belt, rubber barrel, and metal lid kit are each available as replacement parts directly from KomeStone, with no planned end to parts supply. The K1 isn't a one-season purchase — it's a permanent part of your hobby setup.
- 𝟗𝟎-𝐃𝐚𝐲 𝐌𝐨𝐧𝐞𝐲-𝐁𝐚𝐜𝐤 𝐆𝐮𝐚𝐫𝐚𝐧𝐭𝐞𝐞 & 𝟏-𝐘𝐞𝐚𝐫 𝐖𝐚𝐫𝐫𝐚𝐧𝐭𝐲 — 𝐑𝐢𝐬𝐤-𝐅𝐫𝐞𝐞 𝐏𝐮𝐫𝐜𝐡𝐚𝐬𝐞 — Shop with complete confidence. Your K1 is backed by a 90-day satisfaction guarantee and a 1-year warranty. Miss desertcart's return window? Our US-based customer service team offers 24/7 hassle-free replacement or refund support — we've got you covered.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09PYR2RRT |
| Age Range Description | 13 years and up |
| Best Sellers Rank | #4,251 in Toys & Games ( See Top 100 in Toys & Games ) #2 in Kids' Rock Tumblers |
| Brand Name | KomeStone |
| Color | Black |
| Customer Reviews | 4.3 out of 5 stars 3,829 Reviews |
| Educational Objective | Teaching geology, creative design, patience |
| Included Components | 1 pound of rocks & 4 bages of polishing grits & ceramic pellets, 1 rock tumbler base & 1 rubber barrel, 2 PU belts & user instructions, jewelry fastenings & adaptor & screwdriver & mesh strainer |
| Indoor Outdoor Usage | Indoor |
| Item Dimensions | 11.22 x 9.02 x 5.71 inches |
| Manufacturer | KomeStone |
| Manufacturer Maximum Age (MONTHS) | 1200 |
| Manufacturer Minimum Age (MONTHS) | 156 |
| Manufacturer Part Number | CA-KS0107RT17 |
| Material Type | Japanese carbon motor, Top quality of stainless steel, Tyre grade rubber, 𝐂𝐏𝐒𝐈𝐀 & 𝐂𝐏𝐂 𝐂𝐞𝐫𝐭𝐢𝐟𝐢𝐞𝐝 |
| Model Number | K1 |
| Number of Players | 1 |
| Operation Mode | Manual |
| Power Source | AC adapter |
| Set Name | KomeStone K1 Professional Large 2.5LB Capacity Edition |
| Size | Large |
| Supported Battery Types | No batteries required |
| Theme | Lapidary Tool for DIY Jewelry & Crafts, Perfect gift choice for the families or friends, Rock Tumbler Kit for Polishing Stones, Rock Tumbler Starter Kit with Timer & Motor, Rock Tumbler with Grits and Accessories, Stone Polishing Machine for Kids & Adults |
| Unit Count | 1 Count |

## Images

![K1 Quiet Rock Tumbler Kit for Adults, Kids & Families | Reliable 2.5Lb Rotary Rock Polisher, Thick Rubber Barrel, 3 Speeds, 9-Day Timer, Memory Function, Complete Gem Polishing Kit - Image 1](https://m.media-amazon.com/images/I/91qI8mtCfjL.jpg)

## Available Options

This product comes in different **Color** options.

## Questions & Answers

**Q: Replacement belts. How do I order?**
A: Hi, here is the link for the belts: 
https://www.amazon.com/dp/B09S67HKV5/

Or just search KomeStone rock tumbler belts at amazon.com, then you'll find the belts. 

You are also welcome to follow our brand store on amazon.com through this link: https://www.amazon.com/stores/RockTumblerKit/page/98CD222F-C7A7-4372-80AE-0F0370A463C5
you'll find all accessaries related to our rock tumbelrs. 
If you want to contact our customer service, just email us via: support@komestone.com, we'll get back to you very soon!

**Q: Will the starter kit include all 9 kinds of stones or are there just some random rocks?**
A: This rock tumbler kit includs 9 kinds of stones as advertised,  weights around 1lb.

**Q: Can I tumble rocks we find at the park or do they have to be these special rocks?**
A: You can tumble any rocks you’d like, I suggest you get a rock identification app, plus a hardness chart. The rocks you tumble need to be the same hardness or the softer rocks will disappear… this is a lot of fun and the outcome is beautiful

**Q: Can this tumbler be used to polish metal washers?**
A: Based on two factors, yes it can.
#1 The washer must be a metal that could be polished in a conventional method, such as a buffing machine.
#2 That you are using a powder made for polishing.
I will add that I do not recommend polishing metal items in a tumbler,

## Customer Reviews

### ⭐⭐⭐⭐⭐ Nerdy excited!!! LOVE THIS TUMBLER!
*by Y***Y on November 13, 2025*

I ordered this on impulse as my daughter had a national geographic tumbling kit. That one is mediocre at best, however I've always wanted to have one. So, I bought the pro K-1 brushless, and I'm impressed with the rubber basin and how airtight sealed it is. Works incredibly well! Functions are simple to use. Great storage capacity also. The instructions are detailed, easy to understand, easy to follow through. They provide two extra pulley belts for the machine. A screwdriver to pop the lid, as the lid recesses into the rubber basin. There's another lid that goes over that with a butterfly style handle/screw. I have mine set up in my shed, as it's much quieter than the previous rock tumbler I experimented with. This one is awesome because it has a built-in timer that sets how many days you would like to tumble the rocks. The instructions have guidelines and suggestions. And then it also has the speed ratio. There's a pause/play button, so if at any time you want to check on the progress of your tumbling, you may do so and press pause and not lose your day counts by powering it off. This kit comes with grits, step 1- thru 4. They're one time use. KomeStone has grit kits available to purchase and reasonably priced for future tumbling sessions. I'm obviously on day 1, but I'm excited to check back in a few days. Not sure if Amazon allows for video updates or anything of that nature, but I'll try if it allows.

### ⭐⭐⭐⭐⭐ Rock Tumbler: A Gem of a Machine (Mostly)
*by K***O on July 16, 2025*

Alright, rock enthusiasts and aspiring geologists, gather 'round! I recently acquired the KomeStone K1 Pro Professional Cutting-Edge Rock Tumbler, hoping to transform my collection of backyard pebbles into sparkling treasures worthy of a museum (or at least, my mantelpiece). This machine is, indeed, cutting-edge... or at least, it cuts through the rough edges of rocks with impressive dedication. It's like a tiny, geological spa for your stones, giving them the smooth, polished glow they've always dreamed of. My rocks are now so shiny, I'm pretty sure they're starting to develop egos. The "professional" part? Well, it certainly sounds important, and it feels pretty robust. It hums along, doing its thing, turning mundane rocks into mini works of art. I've spent an embarrassing amount of time just watching it spin, mesmerized by the slow, steady transformation. It's surprisingly therapeutic, almost like a lava lamp, but with more potential for bling. My only minor quibble is that I now have an overwhelming urge to collect all the rocks. Every walk is an archaeological dig, every pebble a potential masterpiece. My pockets are perpetually full, and my family is starting to eye me suspiciously when I bring home yet another bag of "future gems." This tumbler is so effective, it's turning me into a rock hoarder. So, if you're looking to polish your pebbles (and perhaps your patience), the KomeStone K1 Pro is a solid investment. Just be warned: you might develop a serious case of "rock fever." It's a gem of a machine, and I'm totally rocking my new hobby!

### ⭐⭐⭐⭐⭐ Great for tumbling small parts and hardware
*by Z***L on October 27, 2025*

I end up with a lot of old hardware and small bits and pieces that come from garage sales, cannibalized equipment, etc. I also restore old tools, work on old cars and motorcycles, etc. I wanted a small tumbler so that I could drop a handful of fasteners or small parts in, let it run for a while, and come back to clean metal. This was a complete shot in the dark. I usually soak parts in vinegar or phosphoric acid when they're rusty, and that works well enough that I wasn't sure if tumbling would work better or be less hassle. On the one hand, there's no acid to neutralize and not much pre-cleaning that has to be done. On the other, you have to deal with abrasive grit, which can get everywhere (and I mean EVERYWHERE). Since I didn't know if I'd like this approach, I didn't want to risk a lot of money on a tumbler. I bought this kit because it was inexpensive and had decent reviews. If this ended up being an essential part of my workflow, I decided that I could always buy something bigger and/or better in the future. So far, this tumbler has been awesome. The first batch of parts that I threw in was a rusty mess of hardware that I'd picked up at a garage sale. This stuff probably hadn't seen the light of day in decades and had a pretty solid layer of rust on it. I skipped the included media and instead filled the tumbler drum with medium (70 grit) aluminum oxide, which is a pretty aggressive grit used for media blasting. I'm not a fan of membrane buttons or plastic construction on most things because I haven't found it to be particularly durable, and this tumbler has both. It certainly doesn't look heavy duty and I didn't expect much out of it. In reality, I didn't even think it would have the power to turn a drum that was chock-full of steel hardware and abrasive, but I gave it a shot. I was pleasantly surprised that the drum started turning effortlessly even at the highest speed. Most of the hardware had settled to one side so the load was imbalanced and the tumbler started to walk across my workbench, but I propped it in place with a heavy box and let it run. After about an hour I checked on the hardware and almost all the rust was gone. I dumped the contents of the drum through a strainer, which made separating the hardware a breeze. What was left was almost completely clean steel, certainly clean enough to use once I blew the last of the grit away with an air hose. I ran a few more handfuls of hardware through this machine with the same results. I also ran a really cheap set of rusty no-name sockets that I bought at (yet another) yard sale. I keep junk sockets around in case I need to modify them for odd sizes or special uses, and these followed me home to be added to the "just in case" pile. The sockets came out fairly clean. The chrome plating is peeling off and while the tumbler knocked off any rust and loose bits of plating, it didn't take everything down to bare metal. That's fine, however, because it did most of the dirty work for me while I was doing something else. I can always give one of these sacrificial sockets a once-over on the wire wheel if I need to weld or modify it, but at least I'm starting with something relatively clean and rust-free. If you tumble steel parts or hardware, just remember that what comes out will be prone to re-rusting pretty quickly. This is because you've abraded off any protective oxide layers that were on the metal. It's a good idea to blow off any remaining media and then oil the metal to protect it. Also be aware that touching the raw metal with bare skin can cause it to rust faster, as the salts and acids in your perspiration all cause oxidation. I usually wear nitrile gloves in the garage so this isn't much of a problem for me. When I pulled this dainty little thing out of the box, I figured it would be good for a couple of uses at best before the motor burned out or something broke. So far I'm pleasantly surprised. It's put in a few hours of work with no complaint and nothing broken, and it does a good job of removing light to moderate rust. The aluminum oxide is a worthwhile investment (I think I paid $20 for 25 pounds or so, and I could've gotten a way better deal if I'd shopped around). Long term durability is still a question of course so we'll see how that goes, but so far this thing punches above its weight.

## Frequently Bought Together

- Rock Tumbler Kit, K1 Professional Large 2.5LB Capacity Edition - Memory Function, Digital Timer & Variable Speeds: Create Stunning Gems Full Accessories Included
- Rock Tumbler Polishing Grits and Ceramic Tumbling Media Kit | Essential for Polishing, 4 Steps Rock Tumbling Refill Media, Polish up to 25 lbs of Rocks, Work with Any Rock Tumblers, for More Tumbles

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-08-11*