This set of 3 of the most popular black Pigma Micron pens contains of Pigma Micron 02 0.30 mm , Pigma Micron 04 0.4 mm, Pigma Micron 08 0.5 mm. Pigma Micron pens are waterproof and permanent fineliners that are loyally used by designers, scientists, archivers, manga artists, cartoonists, illustrators and hobbyists. It is the recommended pen for Zentangle. The fine nib makes this pen ideal for creating both technical and artistic drawings. The unique Sakura Pigma™ ink will not bleed through paper, is permanent, waterproof, fade resistant, quick drying and pH-neutral.