The COPIC Multiliner SP is a waterproof, pigment based pen that you will never throw away. The tips are replaceable and the ink is refillable. Each pen is made from a durable aluminium and comes available in 10 sizes - ultra fine 0.03mm to brush. Compatible with COPIC markers and photocopy safe. SP 0.5mm is refillable with a Multiliner SP Ink Cartridge B (CSPIB)Code: CSP.35