Copic Multiliner SP pens are specific for a life; useful for long-term use. Permanent ink calibrated markers for drawing or writing. The durable aluminum body feels soft in the hand and the tips are very resistant even on the models finer. This pen contains the same Copic compatible black pigment ink as Multiliner. Water-based pigment ink (water / alcohol resistance) Acid free. Once dried, drawings do not run or smear when drawn over marker pens alcohol based on even with watercolours. Ideal for sketches, technical drawings, contours, manga, calligraphy and much more. Son r ultraviolet light resistance Available in 9 hardness graduations plus one in brush type. Hardness: 0.03 / 0.05 / 0.1 / 0.2 / 0.25 / 0.3 / 0.35 / 0.5 / 0.7 / BS Caution: Do not replace the tip and cartridge in your project. Do not insert or remove the tip and cartridge unnecessarily. Store the replacement ink cartridges horizontally. When replacing a tip, make sure the size is the same.