---
product_id: 738075366
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: "฿2411"
currency: THB
in_stock: true
reviews_count: 5
category: "Uni Ball"
url: https://www.desertcart.co.th/products/738075366-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0
store_origin: TH
region: Thailand
---

# Smooth, water & light resistant gel ink 0.28mm ultra micro point for precision Ergonomic rubber grip for comfort 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:** ฿2411
**Availability:** ✅ In Stock

## Summary

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

## 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?** ฿2411 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/738075366-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 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

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.
Review: Nice! - Really great pens!! Smooth lines. I’ll be buying more.

## 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 |
| Country of Origin | USA |
| Customer Reviews | 4.6 out of 5 stars 1,707 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 Height | 0.79 Inches |
| Item Type | retractable |
| Item Weight | 0.05 Kilograms |
| 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 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

![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

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐ Product below quality
*by R***A on 13 October 2024*

The ink quality is not good. May be it is dry. With 0.28 tip i wanted to try it. It has a feeling like when the refill is about to finish

## 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.co.th/products/738075366-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0](https://www.desertcart.co.th/products/738075366-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0)

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-02-26*