Pilot JETSTREAM Black Ballpoint Pen Novelty Set of 10 Stored at home. Although they are unused, I tested each one by writing about 3cm for this listing. They all worked without any problems. Unlike the ones from 100-yen shops, these write smoothly. Especially the JETSTREAM ink is different from conventional oil-based ballpoint pens, being darker and easier to write with. I believe the JETSTREAM pens are 0.7mm, but please understand if this is incorrect. I will wrap them together with plastic wrap for shipping. They will be shipped via Yu-packet Post Mini. - PILOT JETSTREAM - Ink color: Black