Pigma Micron pens are water-resistant and permanent fineliners, often used by designers, scientists, archivists, manga artists, cartoonists, illustrators and hobbyists. This pen is also recommended for Zentangle. The fine tip makes this pen ideal for creating technical and artistic drawings. The unique Sakura Pigma™ ink will not bleed through paper. It is permanent, waterproof, fade-resistant, quick-drying and pH neutral.