Pigma ink, invented by Sakura over 25 years ago, continues to be the most reliable permanent ink on the market today. Artists, consumers, the government, and scientists all rely on the proven permanence of Pigma. This 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 Pigma Graphic felt tip pens come in three useful shapes: a round, 1 mm bullet tip and 2 and 3 mm chisel tips. Great for hand lettering, drawing, and bold writing. Made in Japan.