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! This acid-free, archival set of pigment pens contains an assortment of 9 widths: 0.03, 0.05, 0.1, 0.3, 0.5, 0.8, 1.0, BS (small brush) & BM (medium brush). The ink is considered water & smear proof.