Pigma Micron pens are waterproof and permanent fineliners that are loyally used by designers, scientists, archivists, architects, Manga artists, cartoonists, illustrators and hobbyists. The fine nib makes this pen ideal for creating both technical and artistic drawings. Pigma Micron is the first disposable technical pen using archival pigmented ink. It does not smear, feather, or bleed through on most paper. Nib Size 0.5mm