Memento dye from Tsukineko ink is fast drying and fade resistant. The innovative pad delivers finer impressions and exceptionally even coverage. Permanent when dry, stamped impressions are water resistant. Dries on all paper surfaces including coated and textured papers. These have become the ink pads of choice for copic alcohol marker artists because they will not smear. Water-based, acid-free, non-toxic.Inked area is 3 by 1.75 but raised pad allows you to ink any size stamp.