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. The fineliners have a protective metal sleeve around the extended tip to give extra control and increased resilience when used with drawing aids such as rulers. This permanent, fade resistant, chemically stable, pigment-based ink will not bleed or run if liquids are spilled on or applied to the document after the ink has dried. Perfect for legal situations, Pigma ink is nearly impossible to alter on documents, in log books, or on checks. Architects, archivists, anthropologists, entomologists and laboratories depend on Pigma Micron for record keeping. Pigma Micron is the first disposable technical pen using archival pigmented ink. It does not smear, feather, or bleed through on most paper.Details:Black ink pensSize 08 (0.5 mm)Sold as a set of 3 piecesWorking temperature 5°C - 40°CWater-based pigment inkUnique Pigma ink is permanent, color, water, and light-fastWrites on virtually any porous surface, extremely suitable for use on tracing paperThe ink will not bleed through the paperThe unique Pigma ink is suitable for filing purposes, archival proofMeets ACMI non-toxicity standardsNot recommended for use on fabrics intended to be washed and not evaluated for cosmetic use on skin