---
product_id: 43706154
title: "Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, Black Ink, UMN-155-28, Value Set of 5"
brand: "uni-ball"
price: "€ 20.32"
currency: EUR
in_stock: true
reviews_count: 13
category: "Uni Ball"
url: https://www.desertcart.sk/products/43706154-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0
store_origin: SK
region: Slovakia
---

# Ergonomic rubber grip for comfort Water & light resistant gel ink 0.28mm ultra micro point for precision Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, Black Ink, UMN-155-28, Value Set of 5

**Brand:** uni-ball
**Price:** € 20.32
**Availability:** ✅ In Stock

## Summary

> 🖋️ Write sharp, write smooth, write ahead of the curve.

## Quick Answers

- **What is this?** Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, Black Ink, UMN-155-28, Value Set of 5 by uni-ball
- **How much does it cost?** € 20.32 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/43706154-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-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

- • **Smooth Glide:** Gel ink formula ensures effortless, skip-free writing with no blobs.
- • **All-Day Comfort:** Soft rubber grip designed for extended use without hand fatigue.
- • **Value Pack Power:** Set of 5 pens means you’re always stocked and never caught without your signature tool.
- • **Pinpoint Precision:** Ultra micro 0.28mm tip delivers razor-sharp, clean lines every time.
- • **Reliable & Retractable:** Convenient retractable design keeps your pen protected and ready on the go.

## Overview

The Uni-ball Signo RT1 is a premium retractable gel ink pen featuring an ultra micro 0.28mm tip for precise, clean writing. Its water- and light-resistant black gel ink ensures durability and clarity, while the ergonomic rubber grip offers superior comfort. Sold in a value pack of 5, this pen is perfect for professionals and students seeking reliable, high-performance writing instruments.

## Description

Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Black Ink, UMN-155-28, Value Set of 5

Review: My go-to for years - My go-to pen for years. No skipping, no ink blobs, just clean, thin (0.28) lines through and through till the last drop of ink. Best quality pen I have used and very difficult to find a good thin pen like this! Sleek and well made.
Review: Smooth Writing - Smooth and perfect!

## Features

- Uni-ball Signo RT1 Retractable Gel Ink Pen, UMN-155-28
- The diameter of a lead : Ultra Micro Point 0.28mm, Color : Black Ink
- Because there is no corner at the pen tip, it is not caught on paper, Smooth ink is also excellent in water resistance and light resistance
- Value Pack of 5

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B06Y3S2XKL |
| Additional Features | Retractable |
| Age Range (Description) | Teen |
| Age Range Description | Teen |
| Best Sellers Rank | #7,589 in Office Products ( See Top 100 in Office Products ) #239 in Gel Ink Pens |
| Body Shape | Round |
| Brand | Uni-Ball |
| Brand Name | Uni-Ball |
| Closure Type | Retractable |
| Color | Black |
| Customer Reviews | 4.6 out of 5 stars 1,853 Reviews |
| Drill Point | Ultra Micro |
| Grip Type | rubber |
| Hand Orientation | Ambidextrous |
| Ink Base | Water |
| Ink Color | Black |
| Item Dimensions | 5.91 x 2.17 x 0.79 inches |
| Item Weight | 0.05 Kilograms |
| Line Size | 0.28 millimeters |
| Manufacturer | Uni-ball |
| Material | Rubber |
| Material Type | Rubber |
| Model Number | SG_B06Y3S2XKL_US |
| Recommended Uses For Product | Home, School |
| UPC | 191308002770 |
| Unit Count | 5.0 Count |
| Water Resistance Level | Water Resistant |
| Writing Instrument Form | Roller Ball Pen |
| Writing Technique | gel ink |

## Product Details

- **Age Range (Description):** Teen
- **Brand:** Uni-Ball
- **Color:** Black
- **Ink Color:** Black
- **Writing Instrument Form:** Roller Ball Pen

## Images

![Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, Black Ink, UMN-155-28, Value Set of 5 - Image 1](https://m.media-amazon.com/images/I/41G6JyrC6SL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ My go-to for years
*by D***T on July 6, 2026*

My go-to pen for years. No skipping, no ink blobs, just clean, thin (0.28) lines through and through till the last drop of ink. Best quality pen I have used and very difficult to find a good thin pen like this! Sleek and well made.

### ⭐⭐⭐⭐⭐ Smooth Writing
*by G***A on June 29, 2026*

Smooth and perfect!

### ⭐⭐⭐⭐⭐ Work great!
*by K***6 on January 19, 2023*

I'm one of those people who has an unusual obsession with office supplies. As such, I have tried numerous pens in hopes of finding the ~perfect~ pen to use in my everyday life. These are not the ~perfect~ pen; however, they are pretty great regardless. They are comfortable to hold and use thanks to the rubber grip, and the tips are SUPER fine as promised. After using Micron pens for the first time, I found that I favor pens in the .25-.4mm range for writing as the lines are finer and cleaner, and these definitely meet that expectation. So far, I haven't had any issues with bleeding, smearing, skipping, etc. I think it's because the ink comes out so thin, it dries before it even has a chance to smear; but then, I'm also right-handed, so unless I'm especially careless, I don't have many opportunities to smear my writing. I will say that, because the lines obviously come out thinner and therefore somewhat lighter than .5+ pens, people with poor eyesight may struggle to read things written with these .28mm pens, but I wear glasses so it doesn't bother me. Price wise, I think that these are a good deal. They cost about the same amount as the Papermate InkJoy gel pens and Tul gel pens I've been using, but you get more in a pack and the quality is great. Plus, anything finer than .5mm is frustratingly hard to come by. I definitely recommend giving these a try.

## Frequently Bought Together

- Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, Black Ink, UMN-155-28, Value Set of 5
- UPENOTE Gel Pens 0.28mm Extra Fine Point Pen, Black Ink, Ball Point Pen for School, Office, Stationery Supplies 6 Packs
- Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, UMN-155-28, 10 Color Value Set

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-07-28*