TWSBI ECO Fountain Pen Cosmos Blue w/ Onyx

Specially designed for beginners exploring the world of fountain pens and equally loved by seasoned writers, the TWSBI ECO is a dependable everyday companion.

The TWSBI ECO (economical) offers the same high-quality, high-capacity piston-filling mechanism found in the TWSBI Diamond 580, but at a more accessible price. This Blue w/ Onyx edition features a striking transparent barrel paired with a bold onyx-black cap and accents, creating a clean and modern look. The hexagonal screw-on cap posts securely on the back of the pen for comfortable writing.

Each pen comes in a sleek clear case with a minimalist aesthetic, further protected by an outer cardboard box.

A quick no brainer guide in choosing nib sizes in an overly complicated fountain pen world:

If you write small, go with anEF
For the normal writer,Fis the most popular
If you tend to lean on a bigger font,Mwill be perfect
Bis for statements!! Sign a check in B, write a header in B, do some coloring/shading in B
Stubnibs are italic in writing style (have a special card or invitation to write?)

PERSONALIZE YOUR PEN WITH CITYLUXE:

For Every Pen:	Laser Precision:
Every pen listing offers personalization options. Simply choose your engraving preference during checkout. Add specific instructions or requests in your order notes or contact us via email.	Laser technology ensures precise, detailed engraving. Ideal for intricate designs, especially on metal surfaces. Reveals the base material’s true color.

MATERIALS WE ENGRAVE:

Lacquer Engraving

Metal Engraving

Plastic Engraving

Resin Engraving

If you’re interested in learning more about the engraving process or need comprehensive details about our personalized pen engraving options, please visit our dedicatedEngraving Information for Personalized Pens page.

For questions or assistance, reach out to our team. Your satisfaction is our priority.

Specification

Brand	TWSBI
Product Type	Fountain Pen
Body Material	Resin
Diameter – Grip	10.0mm
Diameter – Max	15.2 mm
Length – Capped	139 mm
Length – Posted	161 mm
Length – Uncapped	131 mm
Filling Mechanism	Piston
Capped or Retractable	Capped – Screw On
Weight – Whole Pen (Empty)	0.75 oz / 21 grams