Black polystyrene extruded foam laminated between two sheets of black paper that feature a faint 1/2" grid 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. Sheets are 3/16" thick. Measures 22" x 28". Includes 10 sheets.