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

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.

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!

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.

I’ve run this tumbler nonstop 24/7 for just over a year. It’s still going, though the lid seal and rollers are worn. Pros: Easy to load, countdown timer, pause button, durable barrel, brushless motor holds up well, fairly quiet, compact, no leaks, and low energy use. Cons: Even on the lowest speed it’s too fast for anything beyond shaping rough rocks and can bruise softer ones (even with ceramic media). You can’t slow it down enough for later stages without changing pulleys. Doesn’t restart automatically after a power outage, and belts wear quicker than I’d like. If you haven’t heard it enough already, the polish that is provided will NOT give you the high polished shine. Overall: Excellent for rough stage one rocks. Once the rough edges are knocked off I move the rocks to a slower tumbler to finish stage one and beyond. It’s a reliable workhorse, though I’ll get the standard motor next time since it’s easier to adjust the speed.

This is a great little tumbler. Works as it should. I accidentally overtightened the screw on handle. Customer Service responded very fast to my email and sent a new lid AND 5 extra belts as a gift. I highly recommend this company and it's products!

The tumbler was exactly what I was hoping for to have fun tumbling the stones that my son and I mine together. The stones that came with the tumbler were very nice as well. The instructions were very clear and easy to follow, along with the equipment actually being easy, but seemingly good quality. The drum seems well designed with good durability, I have not had any leaks. For some reason, the tumbler base malfunctioned after about 2 weeks of use, where the motor stopped working. I reached out to the manufacturer and I'm not exaggerating when I say they were top notch in their response. The reply was very fast, with clear questions and instructions on what they needed from me. I was busy for a few days and took some time to send them my info, and they checked up to make sure I didn't need any help getting it to them. They shipped a new base within 24 hours and it arrived next day shipping. Once I received it, they were very concerned to make sure I received it, the new one was working properly, and I was 100% satisfied with how they resolved the issue. They sent me an email every few days to ensure I didn't have any issues until I got back with them (I wanted to let it run for a week cycle to make sure it was good to go). In addition to the new base, they issued me an additional one year warranty on the replacement. I'm not typically one to go into in depth reviews, but they honestly deserve it, even just for the amazing and friendly customer service, then a very nice tumbler for hobby use. I was already debating possibly upgrading to the larger one in a few months, and I am sold on it now.I will be buying my extra grit from them after this experience, instead of browsing for other sellers. I know that if I'm not satisfied, they will go above and beyond to change that.

Seeing a LOT of complaints from the past two months about motors failing. Guess what? Mine stopped working today, have only had it since December. It ran strong for those two months, then today after I took off a batch of tumbles, when I went to put a new batch in, it doesn't tumble. Display lights up but the motor is cooked. I Emailed their "24/7" customer support" so I'm hoping I actually get a reply. Sounds like Komestone needs to provide better, durable motors if it wants to stay in business, because this is clearly a chronic issue, and this is supposed to be the "upgraded, Professional" model. UPDATE 02/26/2026 - I initially didn't get a reply from Komestone support when I Emailed them, but I suspect it got filtered and never made it to anyone. I used the "request a free gift" QR code and through that I got a fast reply from customer service, where I was able to explain my situation. The rep was very friendly and helpful and arranged a brand new K1 Pro to be shipped to me at no cost, since it was within the warranty period but outside of Amazon's return window. I got the new unit today and confirmed everything is working, so I've revised my review to five stars since the company is making an honest effort to uphold their warranty. Hopefully this new one will last longer. UPDATE #2 03/09/2026: The replacement unit died on me after one full tumbling cycle and a few days on the next. The motor STRUGGLES with any kind of load on the tumbler, even an empty barrel, and only starts spinning the barrel for a few seconds at best before it locks up. The "cutting-edge" motors they are using in this unit are trash. I moved the loaded barrel over to a different brand tumbler base that is rated for a lighter load and it's tumbling it just fine. This is ridiculous. UPDATE #3: The saga continues. KomeStone support sent me new motors which appear to be from a newer production run, so here's hoping they don't suffer the same fates as the previous ones.

The rock tumbler came with everything listed in the product description, and all the parts arrived in good condition. The setup process was straightforward and easy to follow, making it simple to get started right away. I'm excited to see the final results. Based on the estimated tumbling time, it will be about a month before the process is complete, but my initial impression is very positive. So far, everything is working as expected, and I'm looking forward to seeing how the rocks turn out. I'll update my review once the tumbling process is finished.

Completed two cycles so far about 20 days each. Did need to change out one belt. Rubber barrel helps with noise and seals well. No leaks. Would buy again

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Ya quiero usarlo, quiero hacer cristal de mar con trozos de vidrio, pero necesito instrucciones en español. Vienen unos sobres que no sé para qué son, así como un frasco con trocitos blancos. Muchas gracias

Really simple easy to use, spare belts and everything you need to start. Check what stone you put in I had one disintegrate that I found in the bush. I recommend buying a bigger strainer.

Loving my K1 tumbler! Have used it for almost a year now and the results are just as I expected! Some of the rocks come out lovely but primarily I use it for shaping sea glass and pottery sherds for jewelry. Works great! When I had an issue with the lid (totally my fault) they quickly shipped me a replacement part.