---
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: "S$16"
currency: SGD
in_stock: true
reviews_count: 13
category: "Uni Ball"
url: https://www.desertcart.sg/products/43706154-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0
store_origin: SG
region: Singapore
---

# ergonomic 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:** S$16
**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?** S$16 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/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

- • **Comfort Meets Control:** Soft rubber grip designed for extended use without hand fatigue—perfect for marathon meetings or creative sessions.
- • **Sleek Retractable Design:** No cap, no hassle—quickly deploy your pen with a smooth retractable mechanism that fits your on-the-go lifestyle.
- • **Precision in Every Stroke:** Ultra micro 0.28mm tip delivers razor-sharp, clean lines for flawless note-taking and detailed work.
- • **Ink That Lasts and Resists:** Water and light resistant gel ink ensures your writing stays vibrant and smudge-free all day long.
- • **Value Pack for the Ambitious:** Set of 5 pens means you’re always prepared, whether at the office, home, or on the move—never run out of your signature tool.

## 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 ink ensures durability and clarity, while the ergonomic rubber grip offers superior comfort. Sold in a convenient value pack of 5, this pen is ideal for professionals and students seeking 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

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 | #7,998 in Office Products ( See Top 100 in Office Products ) #246 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 1,859 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 kg |
| 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 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 Singapore*
*Store origin: SG*
*Last updated: 2026-08-11*