500 Series Illustration Board for Wet Media is a professional quality board for use with all illustration media. It has a durable vellum finish and is internally sized to accept wet media, from light washes to wet-on-wet applications. This 72 pt. illustration board has paper mounted on both sides of the board to prevent warping. The vellum surface paper is is made from 100% cotton and is acid-free. Because the paper on this illustration board is a heavyweight paper, it is ideally suited for work with all kinds of media. It can take a little heavier touch that some other board you may already have in your art supply.