---
product_id: 28909232
title: "Uni Signo RT1 Gel Ballpoint Pen Black Ink Refills, 0.28mm, Set of 4"
brand: "uni-ball"
price: "€ 10.21"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.hr/products/28909232-uni-signo-rt1-gel-ballpoint-pen-black-ink-refills-0
store_origin: HR
region: Croatia
---

# Set of 4 refills Deep black gel ink 0.28mm ultra-fine precision Uni Signo RT1 Gel Ballpoint Pen Black Ink Refills, 0.28mm, Set of 4

**Brand:** uni-ball
**Price:** € 10.21
**Availability:** ✅ In Stock

## Summary

> 🖊️ Write sharp, write smart — never miss a detail!

## Quick Answers

- **What is this?** Uni Signo RT1 Gel Ballpoint Pen Black Ink Refills, 0.28mm, Set of 4 by uni-ball
- **How much does it cost?** € 10.21 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/28909232-uni-signo-rt1-gel-ballpoint-pen-black-ink-refills-0)

## Best For

- uni-ball enthusiasts

## Why This Product

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

## Key Features

- • **Bulk Pack of 4:** Stay stocked and never run out during critical meetings or creative bursts.
- • **Rich Black Gel Ink:** Smooth, fade-resistant ink that ensures your writing stands out with professional clarity.
- • **Lightweight & Compact:** At just 0.317 ounces, these refills are easy to carry and replace on the go.
- • **Ultra-Fine 0.28mm Tip:** Experience razor-sharp, precise lines that elevate your notes and signatures.
- • **Seamless Compatibility:** Perfectly engineered refills for your Uni Signo RT1 pen, guaranteeing effortless ink flow.

## Overview

The Uni Signo RT1 Gel Ballpoint Pen Black Ink Refills offer ultra-fine 0.28mm tips with smooth, fade-resistant black gel ink. This set of 4 refills ensures continuous, precise writing performance, perfectly compatible with Uni Signo RT1 pens, making it an essential upgrade for professionals who demand clarity and style in every stroke.

## Description

Uni Signo RT1 Gel Ballpoint Pen Black Ink Refills, 0.28mm, Set of 4…

## Features

- Color : Black
- 0.28 mm
- 4 counts
- Refil for Uni ball Signo RT1 UMN-155N-28

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Mitsubishi Pencil Co., Ltd. |
| Brand | Uni-Ball |
| Item Weight | 0.317 ounces |
| Product Dimensions | 5.91 x 0.39 x 3.35 inches |
| Item model number | UMR82.24/4p |
| Is Discontinued By Manufacturer | No |
| Number of Items | 1 |
| Size | 4 Count (Pack of 1) |
| Point Type | Extra Fine |
| Ink Color | Black |
| Manufacturer Part Number | UMR82.24/4p |

## Product Details

- **Brand:** Uni-Ball
- **Style:** Gel,Ballpoint
- **Item dimensions L x W x H:** 5.91 x 0.39 x 3.35 inches
- **Number of Pieces:** 4
- **Manufacturer:** Mitsubishi Pencil Co., Ltd.

## Images

![Uni Signo RT1 Gel Ballpoint Pen Black Ink Refills, 0.28mm, Set of 4 - Image 1](https://m.media-amazon.com/images/I/81qeL0DFZhL.jpg)
![Uni Signo RT1 Gel Ballpoint Pen Black Ink Refills, 0.28mm, Set of 4 - Image 2](https://m.media-amazon.com/images/I/31hCA3affEL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Ink flows well
*by J***L on October 12, 2024*

Ink flows well even point is Very extra- fine!

### ⭐⭐⭐⭐⭐ I love these!
*by J***O on July 8, 2020*

There isn't really much more to add. These pens are great, second to none. The fact that I don't have to throw away more plastic into a landfill when they inevitably run out is just the cherry on top!Buy this!

### ⭐⭐⭐⭐⭐ Perfect
*by P***C on July 30, 2016*

Works perfectly in my Signo pen, which I love. Very "fine" ink flow makes writing in very small print possible, much to the consternation of people who try to read what you're writing while you're in a public place, lol. This refill is as stated in the product info: for Uni-ball Signo RT1 Gel Ballpoint pens; it is extremely easy to replace the old cartridge with the new one - just slips into the pen.

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**Shop now:** [https://www.desertcart.hr/products/28909232-uni-signo-rt1-gel-ballpoint-pen-black-ink-refills-0](https://www.desertcart.hr/products/28909232-uni-signo-rt1-gel-ballpoint-pen-black-ink-refills-0)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-02-19*