Presentations and projects will be taken to a whole new level with foam core boards. The smooth bold black surface has a slightly glossy finish that easily accepts markers crayons paints and adhesives. Lightweight and rigid foam board cuts easily with a knife or razor. Perfect for mounting photographs and artwork 3-D modeling signage poster making and more! Boards measure 20 x 30 with 3/16 (5mm) thick dense white polystyrene foam core and white on back of sheet. Carton of 25 sheets.