Sakura Pigma Micron Pen Set, 3-Pens, .25, .35, .45. These fine-point pens feature waterproof, quick drying pigmented ink for permanency and true color reproduction. Ideal for graphics, drafting, illustration or even accounting! Experience smooth, skip-free writing and crisp ink colors that leave consistent lettering and lines every time. The ink is acid-free, chemically stable and fade resistant.