---
product_id: 54399227
title: "Uni Ball Signo Knock Ballpoint Pen RT1 0.28mm Color, Black (UMN15528.24)"
brand: "三菱鉛筆"
price: "54 zł"
currency: PLN
in_stock: true
url: https://www.desertcart.pl/products/54399227-uni-ball-signo-knock-ballpoint-pen-rt1-0-28mm-color
store_origin: PL
region: Poland
---

# Retractable design 0.28mm precision Made in Japan Uni Ball Signo Knock Ballpoint Pen RT1 0.28mm Color, Black (UMN15528.24)

**Brand:** 三菱鉛筆
**Price:** 54 zł
**Availability:** ✅ In Stock

## Summary

> 🖊️ Write Your Future with Precision!

## Quick Answers

- **What is this?** Uni Ball Signo Knock Ballpoint Pen RT1 0.28mm Color, Black (UMN15528.24) by 三菱鉛筆
- **How much does it cost?** 54 zł with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/54399227-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 Grip:** Designed for comfort, ensuring effortless writing sessions.
- • **Sleek Precision:** Experience the ultra-fine 0.28mm line for impeccable detail.
- • **Lightweight Design:** Weighing only 4.54g, it’s the perfect companion for on-the-go professionals.
- • **Quality Craftsmanship:** Engineered in Japan for superior performance.
- • **Retractable Convenience:** No cap, no fuss—just click and go!

## Overview

The Uni Ball Signo Knock Ballpoint Pen RT1 0.28mm in black is a premium writing instrument designed for professionals who value precision and comfort. With its retractable mechanism and smooth grip, this pen is perfect for everyday use, whether in the office or on the go. Manufactured in Japan, it combines quality craftsmanship with a lightweight design, making it an essential tool for any modern professional.

## Description

Uni Ball Signo Knock Ballpoint Pen RT1 0.28mm Color, Black (UMN15528.24)

## Features

- Package Dimensions: 1.0 cms (L) x 1.3 cms (W) x 14.2 cms (H)
- Product Type: Writing Instrument
- Package Quantity: 1
- Country Of Origin: Japan

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Uni |
| Brand | 三菱鉛筆 |
| Model Number | UMN15528.24 |
| Colour | Black |
| Closure | Retractable |
| Grip Type | smooth |
| Pencil Lead Degree (Hardness) | H |
| Material Type | Metal |
| Number of Items | 1 |
| Size | 1 count (Pack of 1) |
| Point Type | [INF] Medium |
| Line Size | 0.28 mm |
| Ink Colour | Black |
| Manufacturer Part Number | UMN15528.24 |
| Item Weight | 4.54 g |

## Product Details

- **Brand:** 三菱鉛筆
- **Writing instrument form:** Ballpoint Pen
- **Colour:** Black
- **Ink colour:** Black
- **Age range (description):** Adult
- **Material:** Metal
- **Point type:** [INF] Medium
- **Special feature:** リフィラブル, リトラクタブル
- **Unit count:** 1.0 count
- **Model name:** ユニボールシグノＲＴ１

## Images

![Uni Ball Signo Knock Ballpoint Pen RT1 0.28mm Color, Black (UMN15528.24) - Image 1](https://m.media-amazon.com/images/I/515sX17aeUL.jpg)

## Available Options

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

## Questions & Answers

**Q: How many pens are included?**
A: Hi I only received 1 pen but didnt pay this amount for it; it wad much cheaper

## Frequently Bought Together

- Uni Ball Signo Knock Ballpoint Pen RT1 0.28mm Color, Black (UMN15528.24)
- Uni Jetstream EDGE 0.28mm Oil-based Ballpoint Pen, Black Body (SXN100328.24)

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**Shop now:** [https://www.desertcart.pl/products/54399227-uni-ball-signo-knock-ballpoint-pen-rt1-0-28mm-color](https://www.desertcart.pl/products/54399227-uni-ball-signo-knock-ballpoint-pen-rt1-0-28mm-color)

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*Product available on Desertcart Poland*
*Store origin: PL*
*Last updated: 2026-02-06*