The Picma Micron is loyally used by designers, scientists, archivists, manga artists, comic book artists, illustrators, and hobbyists. It is also the recommended pen for Zentangle drawing. Signing a contract or illustrating? Picma Micron is the right choice. The unique Picma ink of the fineliner does not bleed through the paper and is waterproof. The fiber pens can also be excellently used on tracing and translucent paper.