Add dimension to your creativity-these boards are ideal for creating artwork or completing school projects. Designed for durability, lightweight foam display boards feature a polystyrene "memory" core that expands back into shape after cutting for a consistent thickness from edge to edge. Each foam board features smooth surfaces that are perfect for pencils, markers, paints, adhesives and fabrics. Strong enough to resist crushing and denting. Polystyrene Core. Art Board Type: Flat Display & Presentation Board; Material(s): Polystyrene Core; Color(s): White Surface/White Core; Board Size Open (W x H): 20" x 30".