---
product_id: 25317725
title: "Auto NBP-505MN-BK Ballpoint Pen, Oil-based, Black"
brand: "ohto"
price: "S/.59"
currency: PEN
in_stock: true
reviews_count: 8
url: https://www.desertcart.pe/products/25317725-auto-nbp-505mn-bk-ballpoint-pen-oil-based-black
store_origin: PE
region: Peru
---

# Compact 3.6-inch length fits business card slots Aluminum & brass build for premium durability 0.5mm ultra-fine needle tip Auto NBP-505MN-BK Ballpoint Pen, Oil-based, Black

**Brand:** ohto
**Price:** S/.59
**Availability:** ✅ In Stock

## Summary

> 🖋️ Write sharp, carry smart — the pen that fits your hustle.

## Quick Answers

- **What is this?** Auto NBP-505MN-BK Ballpoint Pen, Oil-based, Black by ohto
- **How much does it cost?** S/.59 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pe](https://www.desertcart.pe/products/25317725-auto-nbp-505mn-bk-ballpoint-pen-oil-based-black)

## Best For

- ohto enthusiasts

## Why This Product

- Trusted ohto brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Emergency-Ready EDC:** Always have a reliable pen on hand—perfect for spontaneous meetings or quick annotations.
- • **Smooth Oil-Based Ink:** Low-viscosity ink delivers crisp, consistent lines for flawless note-taking and signing.
- • **Premium Craftsmanship:** Aluminum shaft with brass accents ensures a lightweight yet robust writing experience.
- • **Pocket-Sized Precision:** World’s thinnest retractable pen designed to fit seamlessly in your wallet or business card holder.
- • **Exclusive Refill Compatibility:** Uses specialized R-4C5NP refills for unmatched smoothness and longevity.

## Overview

The Auto NBP-505MN-BK is a Japanese-engineered, ultra-compact retractable ballpoint pen featuring a 0.5mm needle tip and smooth oil-based ink. Crafted from aluminum and brass, it’s designed to fit perfectly in business card holders or wallets, making it the ultimate everyday carry tool for professionals who demand precision and portability.

## Description

Retractable oil-based ballpoint pen. The best feature is a retractable ballpoint pen on the thinnest axis in the world. The total length of 0.4 inch (9.1 mm) x maximum diameter 0.2 inch (5.2 mm), and the total length is about the same length as business cards. Unknock activated by side button The tip is narrow as a needle point. The ink is an improved oil-based ink that is lower viscosity and smoother and produces crisp lines. Comes with a convenient holder (W60 mm x H91 mm) for portability. Business card size allows you to insert it into a business card case or notepad as a bookmark and always carry it with you. This unique ballpoint pen is useful for emergencies. Please use auto R-4C5NP croodile refills. Other products may not fit the product. If you lose the spring inside the main unit and the adapter attached to the top of the core, it will not be able to knock it, so be careful not to lose it.

Review: High quality tiny pen. - High quality workmanship in tiny size. Fits perfectly in wallet with supplied plastic cardholder-with-slot. It fits in tight spaces other pens won't fit when you need to mark an outline of parts for precise work. Great EDC kit addition.
Review: It's a tiny pen! - I have used my pen for about a week when situations came up that I did not feel like looking for another pen, or did not have another one available. The pen is basically the width of a ball point insert, so no wasted space, and shorter than a normal pen. It came with a small plastic card with a loop at the top that could be put in your card like a credit card might, and hold the pen in your wallet, but I've been using mine in a small pouch of everyday useful things and it's convenient to have around. I felt the challenge that this pen would need to balance was accomplishing the 1 thing chose this pen for (being tiny!) without being TOO MUCH of the thing I chose it for (TOO tiny to really be usable, or very flimsy feeling). I feel it's just the right size, and the writing I do is a little worse but not by much compared to a full sized pen. the Pen writes smoothly, even on Rite in the Rain paper which can be a little harder to right on for some pens, even other ballpoints. I've only used it for a week, but so far so good. :)

## Features

- The world's finest retractable permanent ballpoint pen that can also be stored in a business card holder
- Size: Total length 3.6 x shaft diameter 0.1 x maximum diameter 0.2 inches (91 x 3.7 x 5.2 mm); Weight: 0.1 oz (3.1 g); Ball diameter: 0.02 inches (0.5 mm)
- Material: Shaft: Aluminum, Ferrule, Knock: Brass, Clip: SK material, Holder: Polypropylene
- Country of Origin: Japan
- Refill: R-4C5NP Black (0.02 inches (0.5 mm))

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00BS52V94 |
| Best Sellers Rank | #65,989 in Office Products ( See Top 100 in Office Products ) #1,620 in Ballpoint Pens |
| Brand | OHTO |
| Closure | Retractable |
| Color | Black |
| Customer Reviews | 4.4 4.4 out of 5 stars (787) |
| Date First Available | July 2, 2013 |
| Grip Type | Smooth |
| Ink Color | Black |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.16 ounces |
| Item model number | Minimo |
| Line Size | 0.25 |
| Manufacturer | オート |
| Manufacturer Part Number | NBP-505MN-BK |
| Material Type | Aluminum Brass Polypropylene |
| Number of Items | 1 |
| Pencil Lead Degree (Hardness) | 3 |
| Point Type | Extra Fine |
| Product Dimensions | 3.58 x 0.02 x 0.02 inches |
| Size | 1 Count (Pack of 1) |

## Product Details

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

## Images

![Auto NBP-505MN-BK Ballpoint Pen, Oil-based, Black - Image 1](https://m.media-amazon.com/images/I/517K11kLs-L.jpg)

## Questions & Answers

**Q: What is the length of this pen?**
A: About 3 - 9/16"

**Q: Which refill do I order from Amazon for this pen?**
A: It’s labeled “OHTO R-4C5NP 8E”

**Q: so, can i buy refills?**
A: Yes part number: Ohto R-4C5NP it’s cheaper on another site too FYI for $2 instead of $10 on amazon. Jetpens

**Q: whats the plastic holder for? I want this for my small journal that has a loop for a pen, would this work?**
A: OK, what they're calling a "holder" is actually a piece of plastic about the size of a credit card with a sleeve along one side in which the pen fits. I guess you put the card part between pages of a book to hold the pen there? I don't know, it doesn't seem very useful to me. As for the loop on your journal: How small are we talkin'? Because this pen is tiny. TI-NY. It is the approximate length (maybe 3") and diameter of a wooden cocktail pick. I'm not kidding. It's very small and difficult to write with - and I have small hands!  As such, I can't imagine it holds enough ink to write very much. When I bought it, I was looking for something with a super-fine point that was not a gel pen, but this is actually just a super-tiny pen in all respects but was not enough of an expenditure to return it.

## Customer Reviews

### ⭐⭐⭐⭐⭐ High quality tiny pen.
*by R***. on December 4, 2025*

High quality workmanship in tiny size. Fits perfectly in wallet with supplied plastic cardholder-with-slot. It fits in tight spaces other pens won't fit when you need to mark an outline of parts for precise work. Great EDC kit addition.

### ⭐⭐⭐⭐⭐ It's a tiny pen!
*by N***K on July 14, 2023*

I have used my pen for about a week when situations came up that I did not feel like looking for another pen, or did not have another one available. The pen is basically the width of a ball point insert, so no wasted space, and shorter than a normal pen. It came with a small plastic card with a loop at the top that could be put in your card like a credit card might, and hold the pen in your wallet, but I've been using mine in a small pouch of everyday useful things and it's convenient to have around. I felt the challenge that this pen would need to balance was accomplishing the 1 thing chose this pen for (being tiny!) without being TOO MUCH of the thing I chose it for (TOO tiny to really be usable, or very flimsy feeling). I feel it's just the right size, and the writing I do is a little worse but not by much compared to a full sized pen. the Pen writes smoothly, even on Rite in the Rain paper which can be a little harder to right on for some pens, even other ballpoints. I've only used it for a week, but so far so good. :)

### ⭐⭐⭐⭐⭐ Excellent TINY pen!
*by V***M on December 14, 2023*

Wow, I love this very tiny pen. I would say it's more MICRO and probably smaller than any writing utensils you've ever seen because it's also a very thin pen. It feels durable in the hand though and writes great! I have it stashed in my slimfold nano wallet, and it pairs so well with the minimalist theme I have going on in my pocket. I barely notice the difference in my wallet with it in there. This is such a practical and convenient little item to carry around, and I've already had to pull it out to use on the go. It's a great purchase that looks great, and writes great!

## Frequently Bought Together

- Auto NBP-505MN-BK Ballpoint Pen, Oil-based, Black
- OHTO Extremely Thin Mechanical Pencil Minimo Sharp, 0.5mm, Black Body (SP-505MN-Black)
- Zebra Mini Ballpoint Pen 0.7 mm, Silver Body, Black Ink (T-3)

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*Product available on Desertcart Peru*
*Store origin: PE*
*Last updated: 2026-01-23*