SAKURA-Pigma Micron Pens. A fine point drawing and writing pen offering a waterproof quick drying pigment ink. Micron pens will not clog or dry out. Ink will not feather or bleed through even the thinnest papers and is smear proof once dry. The pigment in the ink remains colorful and will not spread when applied. It is fade proof against sunlight or UV light, and is permanent and washable on cotton fabrics. Archival Quality, acid free. This package contains three black pens: #01 (0.25mm), #03 (0.35mm) and #05 (0.45mm).