---
product_id: 27119614
title: "Signo UM-100 Gel Ink Pen - 0.5 mm -10 Pcs (Blue)"
brand: "uni-ball"
price: "€ 23.21"
currency: EUR
in_stock: true
reviews_count: 13
category: "Uni Ball"
url: https://www.desertcart.gr/products/27119614-signo-um-100-gel-ink-pen-0-5-mm-10
store_origin: GR
region: Greece
---

# Waterproof pigment gel ink Uni-Flow system for smooth ink flow 0.5mm micro tip for precision Signo UM-100 Gel Ink Pen - 0.5 mm -10 Pcs (Blue)

**Brand:** uni-ball
**Price:** € 23.21
**Availability:** ✅ In Stock

## Summary

> 🖋️ Elevate your writing game with precision and flow that never quits!

## Quick Answers

- **What is this?** Signo UM-100 Gel Ink Pen - 0.5 mm -10 Pcs (Blue) by uni-ball
- **How much does it cost?** € 23.21 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/27119614-signo-um-100-gel-ink-pen-0-5-mm-10)

## 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

- • **Built to Last:** Durable tungsten carbide ball tip and stainless steel construction for long-lasting smoothness.
- • **Write Without Limits:** Uni-Flow ink system ensures a consistent, uninterrupted flow to the very last drop—no skips, no smudges.
- • **Trusted for Over a Decade:** A top choice for professionals and creatives alike, with a legacy of reliability and style.
- • **Precision at Your Fingertips:** Micro 0.5mm tip delivers ultra-fine 0.3mm lines for crisp, professional writing.
- • **See Your Ink, Plan Your Next Move:** Transparent barrel lets you track ink levels so you’re never caught off guard.

## Overview

The Uni-ball Signo UM-100 Gel Ink Pen features a micro 0.5mm tip that writes ultra-fine 0.3mm lines using waterproof pigment gel ink. Its patented Uni-Flow system guarantees smooth, consistent ink delivery until the last drop. Built with a tungsten carbide ball tip and stainless steel body, this pen combines durability with sleek design. The transparent barrel allows easy ink level monitoring, making it a trusted choice for professionals seeking precision and reliability in every stroke.

## Description

A favourite for over 10 years. High-quality and reliable rollerball featuring waterproof pigment ink and 'Uni-Flow' system to ensure a continuous consistent write to the last drop. Stainless-steel tip with tungsten carbide ball. Micro 0.5mm tip ,writes a 0.3mm line. The see through ink barrel lets you see how much ink is left.

Review: Good quality - I am using the Uni-ball Signo UM-100 Gel Ink Pen - 0.5 mm pens for over 20 years. They fit perfectly my hands and fingers. They write thin and don't leave any marks or ink on the paper. In plus, they have a nice color, be the blue, the red or black or black blue. I wish there were less of the same colour in a pack, and instead 3-4 colours in the same pack. I couldn't find them in any stationary shop only on desertcart and online. Anyway, I love them.
Review: Great pen, good ink, nice fine writing tip. Long! - I got these after reading a recommendation and they do fit the bill. Nice pen, good for writing notes, journal, business etc, no spilling or smudging. Just one thing - these are the longest pens I've ever used, don't know why the barrel is so long, but I got the hang of it after an intial head-scratch. Recommended.

## Features

- Uni-ball Signo UM-100 Gel Ink Pen - 0.5mm - Blue (10pcs Box)
- 0.5mm Gel Ink Rollerball Pen
- Smooth writing Gel ink

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B005644GKK |
| Best Sellers Rank | #151,307 in Office Products ( See Top 100 in Office Products ) #2,660 in Gel Ink Pens |
| Brand | Uni-Ball |
| Closure | Snap |
| Color | Blue |
| Customer Reviews | 4.0 4.0 out of 5 stars (132) |
| Date First Available | June 15, 2011 |
| Grip Type | Smooth |
| Ink Color | Blue |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.423 ounces |
| Item model number | BC30647 |
| Line Size | 0.5 Millimeters |
| Manufacturer | Uni-ball |
| Manufacturer Part Number | 4902778947081 |
| Material Type | Tungsten Carbide |
| Number of Items | 1 |
| Point Type | Micro |
| Product Dimensions | 6.22 x 2.36 x 1.18 inches |
| Size | 10 Count (Pack of 1) |

## Product Details

- **Age Range (Description):** Kid
- **Brand:** Uni-Ball
- **Color:** Blue
- **Ink Color:** Blue
- **Writing Instrument Form:** Roller Ball Pen

## Images

![Signo UM-100 Gel Ink Pen - 0.5 mm -10 Pcs (Blue) - Image 1](https://m.media-amazon.com/images/I/81acTpU47oL.jpg)

## Questions & Answers

**Q: Is this 0.5 or 0.7mm？**
A: 0.5. My preferred pen for years.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good quality
*by Z***N on December 2, 2024*

I am using the Uni-ball Signo UM-100 Gel Ink Pen - 0.5 mm pens for over 20 years. They fit perfectly my hands and fingers. They write thin and don't leave any marks or ink on the paper. In plus, they have a nice color, be the blue, the red or black or black blue. I wish there were less of the same colour in a pack, and instead 3-4 colours in the same pack. I couldn't find them in any stationary shop only on Amazon and online. Anyway, I love them.

### ⭐⭐⭐⭐ Great pen, good ink, nice fine writing tip. Long!
*by B***R on October 2, 2024*

I got these after reading a recommendation and they do fit the bill. Nice pen, good for writing notes, journal, business etc, no spilling or smudging. Just one thing - these are the longest pens I've ever used, don't know why the barrel is so long, but I got the hang of it after an intial head-scratch. Recommended.

### ⭐⭐⭐⭐⭐ My favorite pens
*by G***T on June 6, 2021*

Love these pens. Seem to glide as you write.

## Frequently Bought Together

- Uni-ball Signo UM-100 Gel Ink Pen - 0.5 mm -10 Pcs (Blue)
- Uni-ball Signo UM-100 Gel Ink Pen - 0.5 mm -10 Pcs (Black)
- Uni-ball Signo UM-100 0.5mm Gel Ink Rollerball Pen, Red (10 pcs Box)

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-02-03*