Polystyrene extruded foam laminated between two sheets of paper to form a lightweight but strong and rigid surface. Ideal for crafts, school projects, framing, mounting, displays, posters and exhibits. Easy-to-cut sheets have a smooth surface, and accept a wide range of media including paints. Acid-free. Measures 22" x 28" x 3/16" thick. Sold as a carton of 5 sheets.