Pigma ink, invented by Sakura over 30 years ago, continues to be the most reliable permanent ink on the market today. 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. These pens are ideal for fine detail in sketching, drawing and illustration. Details: Includes assorted colors 05 (0.45 mm) tip size Waterproof, chemical and fade-resistant Bleed-free, quick drying and pH neutral Archival ink