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. The color Multiliners come in a variety of nib sizes and are available in 10 colors including newly released “Pink” and “Lavender”. The smallest pen size is 0.03mm. BS - Brush pen for fine line BM - Brush pen for thick line CS: Calligraphy S - Ideal for intricate, detailed expressions CM: Calligraphy M - The most used linewidths in calligraphy