These high quality pens are waterproof and made with pigment-based, quick drying inks that will not bleed or smear when used with Ciao Copic Markers. The SP model features a durable aluminum body. All Copic multi-liner pens are designed for manga, anime, cartooning, illustration, pen and ink! Replacement nib widths range from ultra fine 0.1mm to Brush Small (BS) and Brush Medium (BM) and can be found here.