Elmer"s Polystyrene Foam Board: * 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 * Cuts cleanly with an X-ACTO knife (sold separately) * Perfect for presentations, signs, architectural models or mounting * Comes in a pack of 10 boards * Available in two sizes