---
product_id: 738075366
title: "Uni-ball 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: "S$0"
currency: SGD
in_stock: false
url: https://www.desertcart.sg/products/738075366-uni-ball-signo-rt1-retractable-gel-ink-pen-ultra-micro
store_origin: SG
region: Singapore
---

# Smooth, water & light resistant gel ink 0.28mm ultra micro point for precision Ergonomic rubber grip for comfort Uni-ball 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:** S$0
**Availability:** ❌ Out of Stock

## Summary

> 🖊️ Write sharp, write smart — precision that keeps you ahead.

## Quick Answers

- **What is this?** Uni-ball 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?** S$0 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/738075366-uni-ball-signo-rt1-retractable-gel-ink-pen-ultra-micro)

## 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 keeps your desk stocked and your ideas flowing without interruption.
- • **Pinpoint Precision:** Ultra micro 0.28mm tip delivers razor-sharp, professional lines for flawless note-taking and detailed work.
- • **Comfort Meets Control:** Rubber grip ensures fatigue-free writing during long meetings or creative sessions.
- • **Effortless Smoothness:** Glide through pages with water-resistant, quick-drying gel ink that resists smudges and fading.
- • **Retractable Convenience:** Click to write, click to protect—no caps to lose, perfect for on-the-go professionals.

## Overview

The Uni-ball Signo RT1 is a retractable gel ink pen featuring an ultra micro 0.28mm tip for exceptional precision. Its smooth, water- and light-resistant black ink ensures clean, professional writing that dries quickly. Designed with an ergonomic rubber grip and offered in a convenient value pack of 5, this pen is ideal for professionals who demand comfort, reliability, 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

## 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 |
| Age Range (Description) | Adult |
| Age Range Description | Adult |
| Body Shape | Round |
| Brand | uni-ball |
| Brand Name | uni-ball |
| Closure Type | Retractable |
| Colour | Black |
| Customer Reviews | 4.6 out of 5 stars 1,791 Reviews |
| Drill Point | ultra micro point |
| Grip Type | Rubber |
| Hand Orientation | Ambidextrous |
| Hardness | HB |
| Included Components | Ink Cartridge |
| Ink Base | Water |
| Ink Colour | Black |
| Item Dimensions | 15 x 5.5 x 2 Centimeters |
| Item Type | retractable |
| Item Weight | 0.05 Kilograms |
| Line Size | 0.28 millimeters |
| Manufacturer | Uni-ball |
| Material | Rubber |
| Material Type | Rubber |
| Model Name | RT1 |
| Model number | SG_B06Y3S2XKL_US |
| Recommended Uses For Product | Drawing, Writing |
| Special Features | Retractable |
| Style Name | Retractable |
| Subject Character | Plain |
| 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):** Adult
- **Brand:** uni-ball
- **Colour:** Black
- **Ink Colour:** Black
- **Writing instrument form:** Roller Ball Pen

## Images

![Uni-ball 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)
![Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, Black Ink, UMN-155-28, Value Set of 5 - Image 2](https://m.media-amazon.com/images/I/41-dQgHq8mL.jpg)
![Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, Black Ink, UMN-155-28, Value Set of 5 - Image 3](https://m.media-amazon.com/images/I/31iKhNcnK2L.jpg)
![Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, Black Ink, UMN-155-28, Value Set of 5 - Image 4](https://m.media-amazon.com/images/I/31ro8xs9S0L.jpg)

## 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
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**Shop now:** [https://www.desertcart.sg/products/738075366-uni-ball-signo-rt1-retractable-gel-ink-pen-ultra-micro](https://www.desertcart.sg/products/738075366-uni-ball-signo-rt1-retractable-gel-ink-pen-ultra-micro)

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-08-23*