---
product_id: 27509822
title: "Uni Signo RT1 Gel Ballpoint Pen Black Ink Refills, 0.38mm, Set of 4"
price: "¥1921"
currency: JPY
in_stock: true
reviews_count: 8
url: https://www.desertcart.jp/products/27509822-uni-signo-rt1-gel-ballpoint-pen-black-ink-refills-0
store_origin: JP
region: Japan
---

# Set of 4 refills 0.38mm tip precision Black ink brilliance Uni Signo RT1 Gel Ballpoint Pen Black Ink Refills, 0.38mm, Set of 4

**Price:** ¥1921
**Availability:** ✅ In Stock

## Summary

> 🖊️ Write Your Legacy with Precision!

## Quick Answers

- **What is this?** Uni Signo RT1 Gel Ballpoint Pen Black Ink Refills, 0.38mm, Set of 4
- **How much does it cost?** ¥1921 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/27509822-uni-signo-rt1-gel-ballpoint-pen-black-ink-refills-0)

## Best For

- Customers looking for quality international products

## Why This Product

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

## Key Features

- • **Vibrant Ink:** Enjoy the rich, deep black ink that makes your notes pop.
- • **Convenient Set:** Stock up with a set of 4 refills, ensuring you're always ready to write.
- • **Precision Writing:** Experience the ultra-fine 0.38mm tip for meticulous detail.
- • **Quality Assurance:** Crafted by Mitsubishi Pencil Co., Ltd., a name synonymous with excellence.
- • **Sustainable Choice:** Refillable design reduces waste, making it a smart choice for eco-conscious professionals.

## Overview

The Uni Signo RT1 Gel Ballpoint Pen Black Ink Refills feature a 0.38mm extra-fine tip, providing precision and clarity for all your writing needs. Manufactured by Mitsubishi Pencil Co., Ltd., this set of 4 refills ensures you never run out of ink when inspiration strikes. Perfect for professionals who value quality and sustainability.

## Description

Uni Signo RT1 Gel Ballpoint Pen Black Ink Refills

Review: Does a good job - Arrived in good shape, does a good job
Review: Not Cost Effective, Possibly More Eco-Friendly - The 0.35 signo pens are my favorite pens. They are ultra fine and write smooth; ink is quick drying so I don't have smudges on my hands after taking notes. Every now and then instead of buying a whole new box, I buy refills and convince myself it's more environmentally "friendly" because it is not a more cost-effective option than buying a whole new box. But, each refill comes individually wrapped in plastic. Would be worth it if switching from a different size. As far as writing quality, would say there is very few pens that compare so if this is a pen you are preferential to, it really is new or refill.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B014CM7KGS |
| Best Sellers Rank | #48,484 in Office Products ( See Top 100 in Office Products ) #377 in Ink Pen Refills |
| Customer Reviews | 4.7 out of 5 stars 108 Reviews |
| Ink Color | Black |
| Item Dimensions | 5.85 x 0.23 x 3.31 inches |
| Item Height | 3.31 inches |
| Item dimensions L x W x H | 5.85 x 0.23 x 3.31 inches |
| Manufacturer | Mitsubishi Pencil Co., Ltd. |
| Number of Pieces | 4 |
| Package Size Name | Set of 4 |
| Point Type | Extra Fine |
| Style | Gel,Ballpoint |

## Product Details

- **Item dimensions L x W x H:** 5.85 x 0.23 x 3.31 inches
- **Manufacturer:** Mitsubishi Pencil Co., Ltd.
- **Number of Pieces:** 4
- **Package Size Name:** Set of 4
- **Style:** Gel,Ballpoint

## Images

![Uni Signo RT1 Gel Ballpoint Pen Black Ink Refills, 0.38mm, Set of 4 - Image 1](https://m.media-amazon.com/images/I/81zJUZCVmiL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Does a good job
*by S***R on May 21, 2025*

Arrived in good shape, does a good job

### ⭐⭐⭐⭐⭐ Not Cost Effective, Possibly More Eco-Friendly
*by C***A on November 11, 2023*

The 0.35 signo pens are my favorite pens. They are ultra fine and write smooth; ink is quick drying so I don't have smudges on my hands after taking notes. Every now and then instead of buying a whole new box, I buy refills and convince myself it's more environmentally "friendly" because it is not a more cost-effective option than buying a whole new box. But, each refill comes individually wrapped in plastic. Would be worth it if switching from a different size. As far as writing quality, would say there is very few pens that compare so if this is a pen you are preferential to, it really is new or refill.

### ⭐⭐⭐⭐⭐ Great!
*by A***E on September 30, 2018*

I'm glad they make these refills. My handwriting is small so I prefer 0.38 and 0.28 pens when I write. These refills were the right fit for my 0.38 pen. It takes me several months to go through all 4 of these refills (but it really depends on how much I write too). I love the way the ink flows and how nice it looks on paper. I notice the difference in my handwriting when I write with these vs. writing with a generic ball pen. I highly recommend these to anyone who has smaller than average handwriting.

## Frequently Bought Together

- Uni Signo RT1 Gel Ballpoint Pen Black Ink Refills, 0.38mm, Set of 4
- Uni-ball Signo RT1 Gel Ballpoint Pen Blue Black Ink Refills, 0.38mm, Set of 4 (Japan import) [Komainu-Dou Original Package]

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-01-26*