Take on your next project by creating signs or presentations easily on the lightweight and smooth surface. The foam board cuts effortlessly with a utility knife or razor. It is made of polystyrene for a long-lasting quality. Perfect for mounting photographs and artwork, 3-D modeling, customizing announcements and displaying information. This product makes adding pictures or material easy using glue or tape. Both the back of the board and foam core are black. Set of 25 black foam boards measuring 20" x 30" and 3/16" (5mm) thick.