---
product_id: 48933251
title: "Diamond 580 Fountain Pen, F Nib, Transparent Demonstrator"
brand: "twsbi"
price: "$170.14"
currency: USD
in_stock: true
category: "Twsbi"
url: https://www.desertcart.us/products/48933251-diamond-580-fountain-pen-f-nib-transparent-demonstrator
store_origin: US
region: United States of America
---

# Clear demonstrator design Includes wrench & silicone grease 1.9cc piston ink capacity Diamond 580 Fountain Pen, F Nib, Transparent Demonstrator

**Brand:** twsbi
**Price:** $170.14
**Availability:** ✅ In Stock

## Summary

> 🖋️ Write Boldly, See Clearly — The Pen That Works as Hard as You Do

## Quick Answers

- **What is this?** Diamond 580 Fountain Pen, F Nib, Transparent Demonstrator by twsbi
- **How much does it cost?** $170.14 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/48933251-diamond-580-fountain-pen-f-nib-transparent-demonstrator)

## Best For

- twsbi enthusiasts

## Why This Product

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

## Key Features

- • **Transparent Elegance:** Crystal-clear demonstrator body showcases the intricate inner workings—because style meets substance.
- • **Gift-Ready Minimalism:** Arrives in a sleek modern clear box, making it the perfect statement piece for your desk or a thoughtful gift.
- • **Effortless Ink Mastery:** Piston fill mechanism holds a generous 1.9cc ink reservoir for uninterrupted creativity.
- • **Maintenance Made Simple:** Comes with a wrench and silicone grease for easy piston lubrication and long-lasting performance.
- • **Precision at Your Fingertips:** Fine F nib delivers smooth, consistent lines perfect for professional note-taking and sketching.

## Overview

The TWSBI Diamond 580 is a premium piston-filling fountain pen featuring a 1.9cc ink capacity and a fine F nib for precise writing. Its transparent acrylic body offers a modern demonstrator style, allowing you to admire the pen’s mechanics in action. Designed for professionals and creatives alike, it includes maintenance tools like a wrench and silicone grease to ensure smooth piston operation over time. Packaged in a sleek clear box, this pen combines functionality, durability, and minimalist elegance for everyday writing, journaling, and artistic projects.

## Description

The new 580 model is an improved version of the Diamond 540, with a piston fill mechanism and 1.9cc ink capacity. Available as a Clear Demostrator, with a choice of nib widths. Comes with a smart, modern clear box and a little vial of silicone grease to lubricate the piston over time. There is an instruction sheet and small spanner to take the piston mechanism from the barrel to allow the lubricating. The nib, ink feed and grip section can also be taken apart for cleaning and maintenence - it is not advised unless necessary, but it can be done. Best advice is to enjoy the great design, writing experience and value! Don't forget that if you are from the UK or EU, when you buy a pen from outside the EU, like the USA, there are added charges when the pen arrives at customs in the UK.

## Features

- Push Button Dosing, Piston, Demonstrator Fountain Pen
- Nib F
- Model Diamond Clear 580
- Material: acrylic, stainless steel

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00BT1BLRU |
| Age Range Description | Adult |
| Best Sellers Rank | 210,467 in Stationery & Office Supplies ( See Top 100 in Stationery & Office Supplies ) 929 in Fountain Pens |
| Body Shape | Cylindrical |
| Brand Name | TWSBI |
| Closure Type | Button |
| Colour | Clear |
| Country Of Origin | Taiwan |
| Customer Reviews | 4.6 4.6 out of 5 stars (354) |
| Drill Point | Fine |
| Global Trade Identification Number | 04711467443120 |
| Grip Type | Cylindrical |
| Hardness | F |
| Included Components | wrench, silicone grease |
| Ink Base | Water |
| Ink Colour | Black |
| Is the Product Left or Right Handed? | Ambidextrous |
| Item Diameter | 14 Millimetres |
| Item Dimensions | 19.1 x 6.1 x 3 centimetres |
| Item Weight | 50 Grams |
| Line Size | 0.3mm |
| Manufacturer | Twsbi |
| Material Type | Aluminum Stainless Steel |
| Model Name | TWSBI Diamond 580 |
| Model Number | M7443120 |
| Recommended Uses For Product | everyday writing, note-taking, journaling, calligraphy, art projects |
| Special Features | Taschen Clip |
| Style | Minimalist |
| Subject Character | TWSBI |
| Theme | Writing & Journaling |
| Unit Count | 1 count |
| Water Resistance Level | Not Water Resistant |
| Writing Instrument Form | Fountain Pen |
| Writing Technique | fountain pen |

## Product Details

- **Age range (description):** Adult
- **Brand:** TWSBI
- **Colour:** Clear
- **Ink colour:** Black
- **Material:** Aluminum Stainless Steel
- **Model name:** TWSBI Diamond 580
- **Point type:** Fine
- **Special feature:** Taschen Clip
- **Unit count:** 1 count
- **Writing instrument form:** Fountain Pen

## Images

![Diamond 580 Fountain Pen, F Nib, Transparent Demonstrator - Image 1](https://m.media-amazon.com/images/I/51uLmeKB4tL.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: Not enough room for two questions..  Do these pens tend to leak?   Mine has, some.**
A: I have 5 of them. One was leaking so where the nib section connects to the barrel. Of course, I overtightened and it broke. The nib section was still screwed into the pen which I could not remove as I do not have the correct tools. I emailed TWIB and was told it was my problem and to order a new pen or parts. Thus, I quit buying from this company. I realize it was my fault and was hoping I could have sent the pen to them to fix. The customer service is terrible.

**Q: Can this pen be filled with an eye Dropper?**
A: Not with an eye dropper, but you can unscrew the grip section of the pen and use a fountain pen syringe to fill the  ink barrel from the top.

**Q: What’s the main difference compared to twsbi eco?**
A: Price.  Apart from that the main difference is appearance. The 580 is a traditional-looking pen and I love them. The Eco is more modern looking. The writing experience is very similar. I believe they use the same nibs and ink-feed mechanism. They are both great - it is a matter of style / personal preference.

**Q: Received my twsbi 580 yesterday.   i notice that the nib seems to spin in it's holder-thing.   is this normal?**
A: Mine does not spin. Could be something in yours is not screwed firmly into place. (There's a way to take it apart and even swap nibs, but I've never done that.)

## Frequently Bought Together

- TWSBI Diamond 580 Fountain Pen nib F
- Twsbi Diamond 50 Ink Bottle (Polished Aluminum)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-10-29*