Professional line PRO. Line thickness 1 mm. Durable aluminum body. Big capacity of ink ensures significantly longer life. Can be opened for up to 30 minutes. Writes on most surfaces, even on oily and wet surfaces. Ideal for carton, photopaper, ribbed surface, wood, metal, foil, stone, plastic, leather and many other surfaces. Water and fading resistant ink. Harmless composition, does not consist of xylene and toluene.