Elmers foam board is built strong and rigid to resist denting and crushing, all while keeping a lightweight profile. The resilient polystyrene core bounces back after cutting to keep the foam board uniform edge to edge. The smooth surface works impeccably with markers, paint, and a variety of other craft decorations. Perfect for crafts, school projects, framing and mounting. Polystyrene.100% recycled content, 90% post-consumer waste.