---
product_id: 272905299
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: "23440CFA"
currency: XOF
in_stock: true
reviews_count: 5
category: "Uni Ball"
url: https://www.desertcart.sn/products/272905299-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0
store_origin: SN
region: Senegal
---

# Ergonomic rubber grip for all-day comfort Water-resistant gel ink for smudge-proof writing 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:** 23440CFA
**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?** 23440CFA with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/272905299-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, sharing with your team or keeping spares at your desk.
- • **Pinpoint Precision:** Ultra micro 0.28mm tip delivers crisp, clean lines for detailed note-taking and professional documents.
- • **Smooth & Smudge-Free:** Water-resistant gel ink ensures your writing stays sharp and vibrant without bleeding or fading.
- • **Comfort Meets Control:** Soft rubber grip designed for fatigue-free writing during long meetings or creative sessions.
- • **Retractable Convenience:** Click-to-use design keeps your pen protected and ready, perfect for on-the-go professionals.

## Overview

The Uni-ball Signo RT1 is a sleek, retractable gel ink pen featuring an ultra-fine 0.28mm tip for exceptional precision. Its water-resistant black ink ensures smudge-proof, long-lasting writing, while the ergonomic rubber grip offers superior comfort. Sold in a value pack of five, it’s the ideal choice for professionals who demand clarity, reliability, and style in every stroke.

## Description

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

Review: Quality precision pens - I’m used to the Zebra Sarasa 0.3 mm, which is my go to pen, and wanted to find something of comparable quality with an even finer tip, to allow for smaller writing that’s still clear. Uni-ball Signo was at the top of the list of many pen reviewers so gave this 0.28 model a try. It’s checking all the boxes - smooth ink flow, micro thin lines, but not scratchy thin. Great value, nice clip, so far so good.
Review: Great pen! - I usually use a 0.38mm tip so it took me a while to get used to the 0.28mm tip but now I use it all the time. The pen writes smoothly and dries quickly.

## 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 |
| Animal Theme | no animal theme |
| Best Sellers Rank | #59,230 in Office Products ( See Top 100 in Office Products ) #1,387 in Gel Ink Rollerball Pens |
| Body Shape | Round |
| Brand Name | uni-ball |
| Closure Type | Retractable |
| Color | Black |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,770) |
| Drill Point | Ultra Fine |
| Grip Type | Rubber |
| Hand Orientation | Ambidextrous |
| Hardness | HB |
| Included Components | Ecology Sticky Notes |
| Ink Base | Water |
| Ink Color | Black |
| Item Diameter | 0.28 Millimeters |
| Item Dimensions | 15 x 5.5 x 2 centimeters |
| Item Weight | 59 g |
| Line Size | 0.3mm |
| Manufacturer | uni-ball |
| Material Type | Rubber |
| Model Name | Uni-ball Signo RT1 |
| Model Number | SG_B06Y3S2XKL_US |
| Recommended Uses For Product | Home, School |
| Style | Modern |
| 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
- **Colour:** Black
- **Ink colour:** 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

### ⭐⭐⭐⭐⭐ Quality precision pens
*by M***Y on 27 April 2026*

I’m used to the Zebra Sarasa 0.3 mm, which is my go to pen, and wanted to find something of comparable quality with an even finer tip, to allow for smaller writing that’s still clear. Uni-ball Signo was at the top of the list of many pen reviewers so gave this 0.28 model a try. It’s checking all the boxes - smooth ink flow, micro thin lines, but not scratchy thin. Great value, nice clip, so far so good.

### ⭐⭐⭐⭐⭐ Great pen!
*by S***K on 29 November 2025*

I usually use a 0.38mm tip so it took me a while to get used to the 0.28mm tip but now I use it all the time. The pen writes smoothly and dries quickly.

### ⭐⭐⭐⭐⭐ Nice!
*by N***K on 29 August 2025*

Really great pens!! Smooth lines. I’ll be buying more.

## 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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**Shop now:** [https://www.desertcart.sn/products/272905299-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0](https://www.desertcart.sn/products/272905299-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0)

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*Product available on Desertcart Senegal*
*Store origin: SN*
*Last updated: 2026-06-18*