---
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: "$27.86"
currency: USD
in_stock: true
reviews_count: 13
category: "Uni Ball"
url: https://www.desertcart.us/products/43706154-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0
store_origin: US
region: United States of America
---

# Ergonomic rubber grip for all-day comfort Smooth, water & light resistant gel 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:** $27.86
**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?** $27.86 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/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

- • **Ready When You Are:** Retractable design means no caps to lose—just smooth, instant writing whenever inspiration strikes.
- • **Comfort Meets Control:** Soft rubber grip extends to the tip, providing fatigue-free writing even during marathon meetings or study sessions.
- • **Precision in Every Stroke:** Ultra-fine 0.28mm tip delivers the sharpest, cleanest lines for detailed writing and note-taking.
- • **Ink That Lasts and Impresses:** Waterproof and fade-resistant gel ink ensures your work stays vibrant and professional under any condition.
- • **Value Pack for the Go-Getter:** Set of 5 pens keeps you stocked and ready, so you never run out during your busiest days.

## Overview

The Uni-ball Signo RT1 is a premium retractable gel ink pen featuring an ultra micro 0.28mm tip for ultra-precise writing. Its smooth, water- and light-resistant black gel ink ensures durability and clarity, while the ergonomic rubber grip offers superior comfort for extended use. Sold in a convenient value pack of 5, this pen is perfect for professionals and students who demand reliability and finesse in every line.

## 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 - Great pen. Writes great, smooth, and dries fast. Interesting choice of the package though
Review: Great pens - Great pens. I love the fine point. They do run out of ink pretty fast. I go through about 1 per week but I just keep a stash on hand.

## 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 | Teen |
| Best Sellers Rank | #5,965 in Office Products ( See Top 100 in Office Products ) #216 in Gel Ink Pens |
| Body Shape | Round |
| Brand Name | Uni-Ball |
| Closure Type | Retractable |
| Color | Black |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,809) |
| 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 Kilograms |
| Line Size | 0.28 millimeters |
| Manufacturer | Uni-ball |
| Material Type | Rubber |
| Model Name | ball point pen |
| Model Number | SG_B06Y3S2XKL_US |
| UPC | 191308002770 |
| Unit Count | 5 Count |
| Writing Instrument Form | Roller Ball Pen |

## 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

### ⭐⭐⭐⭐⭐ Great pen
*by H***I on April 7, 2026*

Great pen. Writes great, smooth, and dries fast. Interesting choice of the package though

### ⭐⭐⭐⭐⭐ Great pens
*by M***L on April 2, 2026*

Great pens. I love the fine point. They do run out of ink pretty fast. I go through about 1 per week but I just keep a stash on hand.

### ⭐⭐⭐⭐⭐ Fantastic!
*by K***. on June 25, 2024*

This pen is fantastic! It writes smoothly, doesn't scratch the paper, and makes the thinnest lines that I've ever seen in a writing pen while still being dark enough to easily read. Some art pens are comparable, but are not really meant for continuous writing like you can with these. I use the pens to fill out care plans and med cards in nursing school and they work nearly perfectly for pages of writing. Recently, only one of the pens that I have been using frequently started skipping slightly even though there's still a decent amount of ink in the pen. Other than that, they have been perfect, especially because the grip/soft area continues to the tip and is comfortable to write with continuously. I've never loved a pen like I love these pens. I'd rate them 9.99 out of 10 (0.01 taken away for the one pen out of the 5 that skips after writing for a while).

## 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

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.us/products/43706154-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0](https://www.desertcart.us/products/43706154-signo-rt1-retractable-gel-ink-pen-ultra-micro-point-0)

---

*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-04-23*