---
product_id: 10764442
title: "uni Ball Signo Knock Ballpoint Pen RT1 0.38mm Color, Black (UMN15538.24)"
brand: "三菱鉛筆"
price: "¥1701"
currency: JPY
in_stock: true
reviews_count: 13
category: "三菱鉛筆"
url: https://www.desertcart.jp/products/10764442-uni-ball-signo-knock-ballpoint-pen-rt1-0-38mm-color
store_origin: JP
region: Japan
---

# Smooth, fast ink flow Elegant black rubber grip 0.38mm ultra-fine precision uni Ball Signo Knock Ballpoint Pen RT1 0.38mm Color, Black (UMN15538.24)

**Brand:** 三菱鉛筆
**Price:** ¥1701
**Availability:** ✅ In Stock

## Summary

> 🖊️ Write sharp, write smart — the pen that means business.

## Quick Answers

- **What is this?** uni Ball Signo Knock Ballpoint Pen RT1 0.38mm Color, Black (UMN15538.24) by 三菱鉛筆
- **How much does it cost?** ¥1701 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/10764442-uni-ball-signo-knock-ballpoint-pen-rt1-0-38mm-color)

## Best For

- 三菱鉛筆 enthusiasts

## Why This Product

- Trusted 三菱鉛筆 brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Trusted Quality:** Join thousands of professionals who rate it 4.4 stars for reliability and style.
- • **Ergonomic Elegance:** Rubber grip designed for comfort during long creative or professional sessions.
- • **Sleek Knock Design:** Snap closure for quick, stylish access—because every second counts.
- • **Effortless Ink Flow:** Enjoy a silky-smooth writing experience that keeps pace with your fast ideas.
- • **Ultra-Fine Precision:** Experience flawless detail with a 0.38mm tip that elevates your handwriting game.

## Overview

The Uni-Ball Signo Knock Ballpoint Pen RT1 features an ultra-fine 0.38mm tip for precise writing, smooth fast-flowing ink, and a comfortable black rubber grip. Its sleek snap closure design combines style and functionality, making it a top choice among professionals seeking reliability and elegance in everyday writing.

## Description

Uni Uni-Ball Signo Knock Ballpoint Pen RT1 0.38mm Color, Black

Review: New favorite pen ever - I used to write with the muji gel pen and decided to go for this une for its aesthetic and based on reviews, I am not disappointed. I usually never write reviews but this one is so worth the money. It writes fast the flow is amazing the 0.38 is perfect for my writing. Aesthetically it’s so elegant too the grip is perfect. Only drawback if I had to really be picky if that it smears a little if you don’t let it dry but it’s perfect for me as I’m right handed. Go for it!!
Review: Best Pen - Uniball Signo 0.38 is my favorite pen regardless of color. Smooth flow, not scratchy like some ultra fine point pens, and no smudging for left handed writers!

## Features

- Uni Knock Ballpoint Pen RT1
- Color Ink Knock Ballpoint Pen
- 0.38mm Point
- Product Dimensions 4.15 x 2.8 x 1.4 inches

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00B57W4QU |
| Best Sellers Rank | #80,263 in Office Products ( See Top 100 in Office Products ) #1,972 in Gel Ink Pens #2,323 in Ballpoint Pens |
| Brand | 三菱鉛筆 |
| Closure | Snap |
| Color | Black |
| Customer Reviews | 4.4 4.4 out of 5 stars (798) |
| Date First Available | March 5, 2013 |
| Grip Type | Rubber |
| Ink Color | Black |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.16 ounces |
| Item model number | UMN15538.24 |
| Line Size | 0.35 |
| Manufacturer | Uni |
| Manufacturer Part Number | UMN15538.24 |
| Material Type | Plastic |
| Number of Items | 1 |
| Point Type | Extra Fine |
| Size | 1 Count (Pack of 1) |

## Product Details

- **Age Range (Description):** Teen
- **Brand:** 三菱鉛筆
- **Color:** Black
- **Ink Color:** Black
- **Writing Instrument Form:** Roller Ball Pen

## Images

![uni Ball Signo Knock Ballpoint Pen RT1 0.38mm Color, Black (UMN15538.24) - Image 1](https://m.media-amazon.com/images/I/61kfQZBdxnL.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ New favorite pen ever
*by A***A on January 11, 2025*

I used to write with the muji gel pen and decided to go for this une for its aesthetic and based on reviews, I am not disappointed. I usually never write reviews but this one is so worth the money. It writes fast the flow is amazing the 0.38 is perfect for my writing. Aesthetically it’s so elegant too the grip is perfect. Only drawback if I had to really be picky if that it smears a little if you don’t let it dry but it’s perfect for me as I’m right handed. Go for it!!

### ⭐⭐⭐⭐⭐ Best Pen
*by L***H on April 22, 2025*

Uniball Signo 0.38 is my favorite pen regardless of color. Smooth flow, not scratchy like some ultra fine point pens, and no smudging for left handed writers!

### ⭐⭐⭐⭐⭐ Best pen I have owned
*by Y***R on April 12, 2025*

Writes ultra fine. I love how the ink writes so smooth.

## Frequently Bought Together

- Uni Ball Signo Knock Ballpoint Pen RT1 0.38mm Color, Black (UMN15538.24)
- Uni Signo RT1 Gel Ballpoint Pen Black Ink Refills, 0.38mm, Set of 4

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**Shop now:** [https://www.desertcart.jp/products/10764442-uni-ball-signo-knock-ballpoint-pen-rt1-0-38mm-color](https://www.desertcart.jp/products/10764442-uni-ball-signo-knock-ballpoint-pen-rt1-0-38mm-color)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-17*