---
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: "$U965"
currency: UYU
in_stock: true
reviews_count: 13
category: "Uni Ball"
url: https://www.desertcart.uy/products/43706154-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0
store_origin: UY
region: Uruguay
---

# ergonomic rubber grip for all-day comfort smooth, 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:** $U965
**Availability:** ✅ In Stock

## Summary

> 🖋️ Write sharp, write smart — the pen that means business.

## 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?** $U965 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.uy](https://www.desertcart.uy/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

- • **Value Pack Power:** Set of 5 pens means you’re always stocked, perfect for the busy professional who demands reliability and style.
- • **Pinpoint Precision:** Ultra micro 0.28mm tip delivers the finest, cleanest lines for flawless note-taking and detailed work.
- • **Comfort Meets Control:** Soft rubber grip extends to the tip, ensuring fatigue-free writing during marathon meetings or creative sessions.
- • **Retractable Convenience:** No cap, no hassle—quick click retractability keeps your pen ready and your workspace clutter-free.
- • **Smudge-Proof Confidence:** Advanced gel ink formula dries instantly, resisting water and fading to keep your writing sharp and professional.

## Overview

The Uni-ball Signo RT1 is a premium retractable gel ink pen featuring an ultra micro 0.28mm tip for ultra-fine, precise lines. Its smooth, water- and light-resistant black ink ensures long-lasting, smudge-free writing. Designed with an ergonomic rubber grip extending to the tip, it offers exceptional comfort for extended use. Sold in a value pack of 5, this pen is ideal for professionals and creatives who demand precision, durability, and style in their everyday writing tools.

## Description

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

Review: Fantastic! - This pen is fantastic! It writes smoothly, doesn't scratch the paper, and makes the thinnest lines that I've ever seen in a writing pen while still being dark enough to easily read. Some art pens are comparable, but are not really meant for continuous writing like you can with these. I use the pens to fill out care plans and med cards in nursing school and they work nearly perfectly for pages of writing. Recently, only one of the pens that I have been using frequently started skipping slightly even though there's still a decent amount of ink in the pen. Other than that, they have been perfect, especially because the grip/soft area continues to the tip and is comfortable to write with continuously. I've never loved a pen like I love these pens. I'd rate them 9.99 out of 10 (0.01 taken away for the one pen out of the 5 that skips after writing for a while).
Review: Work great! - 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.

## 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 |
| Best Sellers Rank | #4,902 in Office Products ( See Top 100 in Office Products ) #203 in Gel Ink Pens |
| Brand | Uni-Ball |
| Closure | Retractable |
| Color | Black |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,790) |
| Date First Available | April 6, 2017 |
| Grip Type | rubber |
| Ink Color | Black |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1.76 ounces |
| Item model number | SG_B06Y3S2XKL_US |
| Line Size | 0.28 millimeters |
| Manufacturer | Uni-ball |
| Manufacturer Part Number | UMN15528.24*5 |
| Material Type | Rubber |
| Number of Items | 5 |
| Point Type | Ultra Micro |
| Product Dimensions | 5.91 x 2.17 x 0.79 inches |
| Size | 1 Count (Pack of 5) |

## 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

### ⭐⭐⭐⭐⭐ Fantastic!
*by K***. on June 25, 2024*

This pen is fantastic! It writes smoothly, doesn't scratch the paper, and makes the thinnest lines that I've ever seen in a writing pen while still being dark enough to easily read. Some art pens are comparable, but are not really meant for continuous writing like you can with these. I use the pens to fill out care plans and med cards in nursing school and they work nearly perfectly for pages of writing. Recently, only one of the pens that I have been using frequently started skipping slightly even though there's still a decent amount of ink in the pen. Other than that, they have been perfect, especially because the grip/soft area continues to the tip and is comfortable to write with continuously. I've never loved a pen like I love these pens. I'd rate them 9.99 out of 10 (0.01 taken away for the one pen out of the 5 that skips after writing for a while).

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ Very fine point!
*by S***A on May 30, 2025*

I LOVE THESE PENS!! This is exactly what I was looking for! I'm using them in my planner and journaling. The writing is smooth and very fine but I can still see the blank ink. Definitely gonna get more when I run out. I'll see how long they last but so far they are great! I'm not sure about the price but seems reasonable to me.

## 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 Uruguay*
*Store origin: UY*
*Last updated: 2026-03-05*