Not enough room for two questions.. Do these pens tend to leak? Mine has, some.

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.

Can this pen be filled with an eye Dropper?

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.

What’s the main difference compared to twsbi eco?

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.

Received my twsbi 580 yesterday. i notice that the nib seems to spin in it's holder-thing. is this normal?

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.)

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Diamond 580 Fountain Pen, F Nib, Transparent Demonstrator

Product ID: 48933251

Details

Age range (description)
Adult
Brand
TWSBI
Colour
Clear
Ink colour
Black
Material
Aluminum Steel
Model name
TWSBI Diamond

🔍Clear demonstrator design

🔧Includes wrench & silicone grease

🖋️1.9cc piston ink capacity

¥26400

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Description

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

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.

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.

Specifications

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

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¥26400

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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