Sakura of America Pigma Micron, Black, 3 Count Set Pigma Micron pens feature waterproof, quick-drying, pigmented inks that will not bleed through the thinnest of papers or fabrics. Once dry, inks are smearproof, permanent and fade resistant, even under sun light or UV light. Nibs do not dry out like most technical pens. 01 (.25mm), 03 (.35mm), 05 (.45mm).