The all-purpose Copic Multiliner inking pen is pigment-based and compatible with Copic markers. Also Multiliner is water-proof – the ink will not bleed with water after the pen line has completely dried. Multiliners are the ideal choice when consistent line flow and precision counts. The black Multiliners offer nine options of nib sizes. Copic pens will not bleed when you colour over them with Copic markers if the pen line has dried completely. If it seems to be bleeding with Copic markers because of its compatibility with paper, let it dry longer and carefully rub off pigment on the surface of paper with an eraser. Do not use except for drawing or writing. Do not drop or shake the pens because the ink may leak out. Always recap tightly after use. The stains of water pigment ink on clothes may not be cleaned off. Do not store in a high temperature. Keep Out of Reach of Children. Always carry with the nib upward. The 4 pens have unique nib sizes including 0.3 mm, 0.1 mm, 0.05 mm and 0.03 mm.