---
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: "R590"
currency: ZAR
in_stock: true
reviews_count: 5
category: "Uni Ball"
url: https://www.desertcart.co.za/products/272905299-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0
store_origin: ZA
region: South Africa
---

# comfortable rubber grip water & light resistant ink 0.28mm ultra micro point 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:** R590
**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?** R590 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/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

- • **Effortless Comfort:** Ergonomic rubber grip designed for extended use without hand fatigue—write smarter, not harder.
- • **Smudge-Proof Confidence:** Water and light resistant gel ink ensures your writing stays crisp and vibrant all day long.
- • **Sleek Retractable Design:** No cap, no hassle—quickly deploy your pen and stay productive on the go.
- • **Precision in Every Stroke:** Ultra micro 0.28mm tip delivers razor-sharp, clean lines for flawless note-taking and detailed work.
- • **Value Pack for the Ambitious:** Set of 5 pens keeps you stocked and ready to impress in meetings, brainstorming sessions, and beyond.

## Overview

The Uni-ball Signo RT1 is a premium retractable gel ink pen featuring an ultra-fine 0.28mm tip for precise, clean writing. Its water- and light-resistant ink guarantees durability, while the rubber grip ensures comfort during long writing sessions. Sold in a convenient value pack of five, this pen is perfect for professionals who demand reliability and style in their everyday 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: 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: 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 |
| Age range (description) | Teen |
| Animal Theme | no animal theme |
| Best Sellers Rank | #49,895 in Office Products ( See Top 100 in Office Products ) #1,107 in Gel Ink Rollerball Pens |
| Body Shape | Round |
| Brand | uni-ball |
| Brand Name | uni-ball |
| Closure Type | Retractable |
| Color | Black |
| Colour | Black |
| Customer Reviews | 4.6 out of 5 stars 1,803 Reviews |
| Drill Point | Ultra Fine |
| Grip Type | Rubber |
| Hand Orientation | Ambidextrous |
| Hardness | HB |
| Included Components | Ecology Sticky Notes |
| Ink Base | Water |
| Ink Color | Black |
| Ink colour | Black |
| Item Diameter | 0.28 Millimeters |
| Item Dimensions | 15 x 5.5 x 2 centimeters |
| Item Weight | 0.05 Kilograms |
| Line Size | 0.3mm |
| Manufacturer | uni-ball |
| Material | Rubber |
| 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 |
| Writing instrument form | Roller Ball Pen |

## 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

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

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ Super fine tip for the sharp lovers
*by C***R on 18 July 2026*

Ultra fine, excellent pens!

## 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 South Africa*
*Store origin: ZA*
*Last updated: 2026-08-19*