The refill ink cartridge A is suitable for sizes 0.03, 0.05, and 0.1 mm Copic Multiliner SPs. The Multiliner SP inking pens are pigment-based, and provide the highest quality for all your inking needs. The ink cartridges and replacement nibs are available so you never need to throw these durable aluminum bodied pens away. Details:BlackCompatible with Copic Multiliner SP sizes: 0.03, 0.05, and 0.1 mmAluminum bodyWaterproof and archival