Pack of two ink refill cartridges for the Tachikawa Comic Nib Fountain pen. Black and sepia available. When inserting cartridges, please insert with pen facing down. The pen is intended for frequent use. If it is not used for two weeks or more, it will dry up. If it dries up, please soak the tip in water to revive it. If the pen is dry for more than three weeks, it will be permanently damaged.