Strong lightweight and rigid with a 3/16in polystyrene CFC-free core that springs back to original thickness when cut. Smooth surface accepts screen printing glue paint or markers. Perfect for crafts school projects signage framing and mounting. Art Board Type: Foam; Material(s): CFC-Free Polystyrene Foam Core; Color(s): White Surface/White Core; Board Size (W x H): 30in x 40in.