---
product_id: 399289203
title: "uni Ball Signo Knock Ballpoint Pen RT1 0.28mm Color, Blue (UMN15528.33)"
brand: "三菱鉛筆"
price: "$17.17"
currency: USD
in_stock: true
url: https://www.desertcart.us/products/399289203-uni-ball-signo-knock-ballpoint-pen-rt1-0-28mm-color
store_origin: US
region: United States of America
---

# Smooth retractable mechanism Vibrant blue ink for standout notes 0.28mm ultra-fine precision uni Ball Signo Knock Ballpoint Pen RT1 0.28mm Color, Blue (UMN15528.33)

**Brand:** 三菱鉛筆
**Price:** $17.17
**Availability:** ✅ In Stock

## Summary

> 🖋️ Write sharp, stand out sharper.

## 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?** $17.17 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/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

- • **Vivid Blue Ink:** Make your ideas pop with rich, eye-catching blue that commands attention.
- • **Ultra-Fine 0.28mm Tip:** Experience razor-sharp precision for flawless writing and detailed note-taking.
- • **Sleek Retractable Design:** No cap, no hassle—just click and write with effortless style and convenience.
- • **Lightweight & Comfortable Grip:** Weighing only 4.54g, it’s designed for marathon brainstorming sessions without fatigue.
- • **Authentic Japanese Craftsmanship:** From Uni, a trusted brand delivering reliability and smoothness in every stroke.

## Overview

The 三菱鉛筆uni Ball Signo Knock Ballpoint Pen RT1 features an ultra-fine 0.28mm tip with vibrant blue ink, housed in a lightweight, retractable plastic body. Designed in Japan by Uni, it offers smooth writing performance and a comfortable grip, perfect for professionals who demand precision and style in their everyday writing tools.

## Description

uni Ball Signo Knock Ballpoint Pen RT1 0.28mm Color, Blue (UMN15528.33)

## 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 |
|---------------|-------|
| Manufacturer | Uni |
| Brand | 三菱鉛筆 |
| Model number | UMN15528.33 |
| Color | Blue |
| Closure | Retractable |
| Grip Type | Smooth |
| Pencil Lead Degree (Hardness) | H |
| Material Type | Plastic |
| Number of Items | 1 |
| Size | 1 Count (Pack of 1) |
| Point Type | Mikro |
| Line Size | 0.3mm |
| Ink Color | Blue |
| Manufacturer Part Number | UMN15528.33 |
| Item Weight | 4.54 g |

## Product Details

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

## 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, Size** options.

## 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.us/products/399289203-uni-ball-signo-knock-ballpoint-pen-rt1-0-28mm-color](https://www.desertcart.us/products/399289203-uni-ball-signo-knock-ballpoint-pen-rt1-0-28mm-color)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-08*