Colored foam board accepts markers and can be screen printed or painted. White 3/16in polystyrene core is CFC-free and cuts cleanly with an X-ACTO® knife (sold separately.). Art Board Type: Foam; Material(s): CFC-Free Polystyrene Foam Core; Color(s): Graystone Surface/White Core; Board Size (W x H): 20in x 30in.