Pre-cut sheets are uniform & even in size! Lightweight but strong & rigid to resist denting & crushing. Resilient polystyrene core bounces back after cutting to keep the board uniform edge to edge. The smooth surface satisfies a wide range of media including markers & paint. Perfect for crafts, school projects, framing & mounting. Art Board Type: Tack Display Board; Material(s): Polystyrene Core; Color(s): White; Board Size (W x H): 18" x 24".