---
product_id: 399289203
title: "uni Ball Signo Knock Ballpoint Pen RT1 0.28mm Color, Blue (UMN15528.33)"
brand: "三菱鉛筆"
price: "70.74 DT"
currency: TND
in_stock: true
reviews_count: 5
category: "三菱鉛筆"
url: https://www.desertcart.tn/products/399289203-uni-ball-signo-knock-ballpoint-pen-rt1-0-28mm-color
store_origin: TN
region: Tunisia
---

# Retractable convenience 0.28mm ultra-fine tip Precision Japanese craftsmanship uni Ball Signo Knock Ballpoint Pen RT1 0.28mm Color, Blue (UMN15528.33)

**Brand:** 三菱鉛筆
**Price:** 70.74 DT
**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 0.28mm Color, Blue (UMN15528.33) by 三菱鉛筆
- **How much does it cost?** 70.74 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/399289203-uni-ball-signo-knock-ballpoint-pen-rt1-0-28mm-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

- • **Smooth Ink Flow:** Enjoy consistent, vibrant blue ink that glides effortlessly with every stroke.
- • **Trusted Quality:** Crafted in Japan by 三菱鉛筆, a brand synonymous with reliability and innovation.
- • **Pinpoint Precision:** Experience flawless, ultra-fine 0.28mm lines for detailed, professional writing.
- • **Retractable Design:** Click and write—no cap, no hassle, perfect for on-the-go productivity.
- • **Lightweight & Sleek:** At just 5g with a smooth grip, it’s designed for all-day comfort and style.

## Overview

The 三菱鉛筆 uni Ball Signo Knock Ballpoint Pen RT1 features an ultra-fine 0.28mm tip delivering precise, clean lines in vibrant blue ink. Its retractable design offers quick, cap-free use, while the lightweight plastic body ensures comfortable writing. Made in Japan, this pen combines expert craftsmanship with smooth ink flow, ideal for professionals who demand accuracy and style in their everyday writing tools.

## Description

Uni Uni-Ball Signo Knock Ballpoint pen RT1 0.28mm Color, Blue

Review: le plus fin - le plus fin des stylo gel que l'on peut trouver. Ecrit très bien malgré la finesse du trait. Parfait pour ceux qui aiment écrire petit.
Review: Great - I’m a fan of very fine pens and this one is just 0.28. The ink flow is smooth and the color is lovely.

## Features

- Country of Origin : Japan
- Color ink Knock ballpoint pen
- The Package Height of the Product is 1.0 inches
- The Package Length of the Product is 1.0 inches

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00B57P7YG |
| Additional Features | Retractable |
| Age Range Description | Teen |
| Age range (description) | Teen |
| Best Sellers Rank | #68,927 in Office Products ( See Top 100 in Office Products ) #1,501 in Retractable Ballpoint Pens |
| Body Shape | Round |
| Brand | 三菱鉛筆 |
| Brand Name | 三菱鉛筆 |
| Closure Type | Retractable |
| Color | Blue |
| Colour | Blue |
| Customer Reviews | 4.4 out of 5 stars 688 Reviews |
| Drill Point | Mikro |
| Global Trade Identification Number | 04902778142561 |
| Grip Type | Smooth |
| Hand Orientation | Ambidextrous |
| Hardness | H |
| Included Components | Ink Cartridge |
| Ink Base | Oil |
| Ink Color | Blue |
| Ink colour | Blue |
| Item Diameter | 11 Millimeters |
| Item Type Name | Gel Ballpoint Pen |
| Item Weight | 5 g |
| Line Size | 0.3mm |
| Manufacturer | Uni |
| Material | Plastic |
| Material Type | Plastic |
| Model Name | Signo Knock |
| Model Number | UMN15528.33 |
| Pattern | single item |
| Recommended Uses For Product | Writing |
| Style | Modern |
| Theme | Fantasy |
| Unit Count | 1 Count |
| Water Resistance Level | Not Water Resistant |
| Writing Instrument Form | Ballpoint Pen |
| Writing Technique | ballpoint |
| Writing instrument form | Ballpoint Pen |

## Product Details

- **Age range (description):** Teen
- **Brand:** 三菱鉛筆
- **Colour:** Blue
- **Ink colour:** Blue
- **Writing instrument form:** Ballpoint Pen

## Images

![uni Ball Signo Knock Ballpoint Pen RT1 0.28mm Color, Blue (UMN15528.33) - Image 1](https://m.media-amazon.com/images/I/51IaPS208eL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ le plus fin
*by C***N on 6 April 2018*

le plus fin des stylo gel que l'on peut trouver. Ecrit très bien malgré la finesse du trait. Parfait pour ceux qui aiment écrire petit.

### ⭐⭐⭐⭐⭐ Great
*by Y***A on 14 April 2026*

I’m a fan of very fine pens and this one is just 0.28. The ink flow is smooth and the color is lovely.

### ⭐⭐⭐⭐⭐ Good
*by A***O on 3 June 2026*

Perfect!!

## Frequently Bought Together

- Uni Ball Signo Knock Ballpoint Pen RT1 0.28mm Color, Blue (UMN15528.33)
- Uni-ball Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, Black Ink, UMN-155-28, Value Set of 5
- Uni Japan Signo RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Renewal 2021 Rubber Grip, Blue Black 3 Pens With Kanji LOVE Sticker

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**Shop now:** [https://www.desertcart.tn/products/399289203-uni-ball-signo-knock-ballpoint-pen-rt1-0-28mm-color](https://www.desertcart.tn/products/399289203-uni-ball-signo-knock-ballpoint-pen-rt1-0-28mm-color)

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-11-13*