Pigma 10 Pack Micron Pen 01 .25mm Open Stock-Black 10 brand new sakura pigma micron 01 pens: Ink Color Black Ink micron 01 has a .25mm line width Archival quality ink for use in acid-free environments Chemically stable, waterproof, and fade resistant No smears, feathers, or bleed-through on most papers technical and artistic applications.