---
product_id: 264692039
title: "Signo Dx Um-100 Gel Ink Pen - 0.5 Mm - 10 Pcs - Uni Mitsubishi Pencil(Black)"
brand: "uni-ball"
price: "₨9378"
currency: LKR
in_stock: true
reviews_count: 7
category: "Uni Ball"
url: https://www.desertcart.lk/products/264692039-signo-dx-um-100-gel-ink-pen-0-5-mm
store_origin: LK
region: Sri Lanka
---

# Waterproof pigment gel ink Uni-Flow system for smooth ink flow 0.5mm micro tip for precision Signo Dx Um-100 Gel Ink Pen - 0.5 Mm - 10 Pcs - Uni Mitsubishi Pencil(Black)

**Brand:** uni-ball
**Price:** ₨9378
**Availability:** ✅ In Stock

## Summary

> 🖋️ Write like a pro, never miss a beat.

## Quick Answers

- **What is this?** Signo Dx Um-100 Gel Ink Pen - 0.5 Mm - 10 Pcs - Uni Mitsubishi Pencil(Black) by uni-ball
- **How much does it cost?** ₨9378 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/264692039-signo-dx-um-100-gel-ink-pen-0-5-mm)

## 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

- • **Sleek Transparency:** See-through barrel lets you track ink levels, so you’re never caught off guard mid-meeting.
- • **Unstoppable Ink Flow:** Uni-Flow system guarantees a consistent, skip-free writing experience until the very last drop.
- • **Durable Craftsmanship:** Stainless steel tip with tungsten carbide ball offers long-lasting smoothness and reliability.
- • **Precision in Every Stroke:** Micro 0.5mm tip delivers crisp, clean lines perfect for detailed notes and professional documents.
- • **Waterproof & Fade-Resistant:** Pigment-based gel ink ensures your work stays vibrant and smudge-proof, even under pressure.

## Overview

The Uni-ball Signo Dx UM-100 is a premium gel ink rollerball pen featuring a precise 0.5mm tip, waterproof pigment ink, and a patented Uni-Flow system for smooth, consistent writing. Its transparent barrel allows easy ink monitoring, while the durable stainless steel tip ensures longevity. Ideal for professionals seeking reliability and finesse in every line.

## 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: Wrong description - Although the pen is described as 0.5mm, it is 0.7mm.
Review: 0.7 mm - The ball size for the pen is 0.7 mm not 0.5 mm which makes the font size wider and uncomfortable for me.

## 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 | #55,555 in Office Products ( See Top 100 in Office Products ) #151 in Rollerball Pens |
| Brand | uni-ball |
| Closure | Snap |
| Color | Blue |
| Customer Reviews | 4.1 4.1 out of 5 stars (125) |
| Date First Available | 10 May 2014 |
| Grip Type | Smooth |
| Ink Color | Blue |
| Item Weight | 12 g |
| Line Size | 0.5mm |
| Manufacturer | Uniball |
| Manufacturer Part Number | 4902778947081 |
| Material Type | Plastic |
| Model number | BC30647 |
| Number of Items | 10 |
| Point Type | Extra Fine |
| Product Dimensions | 15.8 x 6 x 3 cm; 12 g |
| Size | 10 Count (Pack of 1) |

## Product Details

- **Age range (description):** Kid
- **Brand:** uni-ball
- **Colour:** Blue
- **Ink colour:** Blue
- **Writing instrument form:** Roller Ball Pen

## Images

![Signo Dx Um-100 Gel Ink Pen - 0.5 Mm - 10 Pcs - Uni Mitsubishi Pencil(Black) - 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

### ⭐⭐ Wrong description
*by J***P on 15 February 2024*

Although the pen is described as 0.5mm, it is 0.7mm.

### ⭐⭐ 0.7 mm
*by Z***O on 1 October 2023*

The ball size for the pen is 0.7 mm not 0.5 mm which makes the font size wider and uncomfortable for me.

### ⭐⭐⭐⭐⭐ Review
*by Z***N on 2 December 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.

## 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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**Shop now:** [https://www.desertcart.lk/products/264692039-signo-dx-um-100-gel-ink-pen-0-5-mm](https://www.desertcart.lk/products/264692039-signo-dx-um-100-gel-ink-pen-0-5-mm)

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*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-02-02*