TWSBI ECO Cosmos Blue with Onyx Nobile Note All you have to do

All you have to do is pop it onto the back of the nib (underneath the breather hole) and you're ready to go

No wonder they are considered an essential in every fountain pen lover's writing kit

Deep blue — inspired by Honoré de Balzac

浮世絵インク

TWSBI ECO Cosmos Blue with Onyx Nobile Note All you have to doThe TWSBI Eco Cosmo Blue with Onyx fountain pen expands the iconic Eco collection, renowned for its balance of quality, functionality and contemporary design. This special edition stands out with a cosmic blue cap, enriched by swirling tones reminiscent of glowing galaxies and shifting light. The translucent turquoise end cap adds a fresh and vibrant contrast, while the onyx black ruthenium trims clip, rings and nib bring a refined and modern look.