JETSTREAM 10-piece set, black, novelty item, 0.7mm Stored at home. Although unused, I tested each pen by writing about 3cm for this listing. They all worked without any problems. Unlike the ones from 100-yen shops, these write smoothly and with a darker ink. I believe the thickness is 0.7mm, but please understand if it's different. I will wrap them together with plastic wrap for shipping. I will ship via Yu-packet Post Mini. - JETSTREAM - Ink color: Black