TWSBI Obsidian Fountain Pen《Medium》 Diary Book Enjoy your nib’s unique transformation

Enjoy your nib’s unique transformation

Top notes: Meyer lemon

plus a credit card/ID slot

carrying snacks

TWSBI Obsidian Fountain Pen《Medium》 Diary Book Enjoy your nib’s unique transformationTWSBI fountain pens are renowned for their high quality and affordability, offering advanced filling mechanisms usually found in more expensive pens. The TWSBI ECO features a high capacity piston filler, a sleek transparent barrel that lets you keep track of your ink level, and a hexagonal screw on cap. How to use the Piston Filler Fountain pen by TWSBI: Simply unscrew the end cap, dip into ink, screw back the end cap, and your done! Ready to write!