Polystyrene, extruded, laminated foam board is ideal for crafts, school projects, framing, mounting, displays and exhibits. Smooth surface accepts a wide range of media, including markers and paints. Rigid surface resists denting. Art Board Type: Railroad, Tag & Poster Board; Material(s): Polystyrene Core; Color(s): White; Board Size (W x H): 20" x 30".