---
product_id: 272905304
title: "uni Ball Signo Knock Ballpoint Pen RT1 0.28mm Color, Black (UMN15528.24)"
price: "¥1574"
currency: JPY
in_stock: true
url: https://www.desertcart.jp/products/272905304-uni-ball-signo-knock-ballpoint-pen-rt1-0-28mm-color
store_origin: JP
region: Japan
---

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

**Price:** ¥1574
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** uni Ball Signo Knock Ballpoint Pen RT1 0.28mm Color, Black (UMN15528.24)
- **How much does it cost?** ¥1574 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/272905304-uni-ball-signo-knock-ballpoint-pen-rt1-0-28mm-color)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00B57LNP8 |
| Best Sellers Rank | #41,759 in Office Products ( See Top 100 in Office Products ) #1,026 in Ballpoint Pens #1,182 in Gel Ink Pens |
| Brand | 三菱鉛筆 |
| Color | Black |
| Customer Reviews | 4.4 4.4 out of 5 stars (660) |
| Date First Available | March 5, 2013 |
| Grip Type | Smooth |
| Ink Color | Black |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.16 ounces |
| Item model number | UMN15528.24 |
| Line Size | 0_3mm |
| Manufacturer | Uni |
| Manufacturer Part Number | UMN15528.24 |
| Material Type | Plastic |
| Number of Items | 1 |
| Pencil Lead Degree (Hardness) | H |
| Point Type | [INF] Medium |
| Size | 1 Count (Pack of 1) |

## Product Details

- **Age Range (Description):** Adult
- **Brand:** 三菱鉛筆
- **Color:** Black
- **Ink Color:** Black
- **Writing Instrument Form:** Ballpoint Pen

## 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)

## Questions & Answers

**Q: Are there refills available for this pen?**
A: Yes.  Just search for them in the search box at the top of the page, asking for the refills of_____________ and type the pen's name.  Make certain you include RT1 and the 0.28mm, as there is also an RT, and there are also different pen point sizes.

**Q: Is this truly a ballpoint pen? It looks almost identical to the signo gel pen.**
A: My husband uses it at work, he says it is an actual ball point pen, however  the pocket clip broke the first day, otherwise it works great.

**Q: Will it bleed through Bible pages?**
A: No.

**Q: Pictures of writing with a comparison to a common object such as a piece of currency, please?**
A: not sure where this pen currently is but i can say this, i write small and had trouble with other fine pens bleeding my writing together and this pen did not bleed like others

## 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.jp/products/272905304-uni-ball-signo-knock-ballpoint-pen-rt1-0-28mm-color](https://www.desertcart.jp/products/272905304-uni-ball-signo-knock-ballpoint-pen-rt1-0-28mm-color)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-03-19*