Sakura developed and patented Pigma ink in 1982. It was the first ink in the world in which pigment and water were combined. This ink has since become the standard for reliable, permanent and archival quality ink. Although it was originally developed as a technical drawing instrument, Pigma is now used in various pens and brushes by technical professionals, in research laboratories and by creative artists for numerous applications. The unique Sakura Pigma ink will not bleed through paper, and is permanent, waterproof, fade-resistant, quick drying and pH neutral. Selection of 6 of the most popular Black Pigma Micron pens with different nib widths: 1 x 005 (0.2 mm), 1 x 01 (0.25 mm), 1 x 02 (0.30 mm), 1 x 03 (0.35 mm), 1 x 05 (0.45 mm), 1 x 08 (0.50 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.