Pre-cut foam board is perfect for smaller projects that don't need a full size sheet. The smooth, bright white surface has a slightly glossy finish that easily accepts markers, crayons, paints, and adhesives. Lightweight and rigid, foam board cuts easily with a utility knife or razor. Perfect for mounting photographs and artwork, 3-D modeling, small signage, and scaled down arts and crafts. Boards measure 16" x 20" with 3/16" (5mm) thick, dense white polystyrene foam core and white on back of sheet. Carton of 25 sheets.