ELMERS Foam Board, White Surface with White Core, 30 X40, 25 Boards/Carton (950510) Foam board with one color throughout has a 3/16 polystyrene CFC-free core. Smooth surface accepts screen printing, glue, paint or markers. Polystyrene CFC-free 3/16 core. Strong, lightweight and rigid. This is an aftermarket of generic part