PILOT black ink cartridges, 12-pack, perfect for fountain pens. - Color: Black - Cartridge Count: 11 cartridges (one used) - Brand: PILOT - Model: IRF-12S-B Although it's a 12-pack, one cartridge has been used, leaving 11. I'm selling these because I no longer need them. There is a tear in a part of the box. Thank you for looking.