3M Porcelain Dry Erase Boards feature a durable porcelain surface that will not scratch, dent, stain or ghost under normal usage. 3M Porcelain Dry Erase Boards are magnetic, have a galvanized steel backing for extra durability. High quality aluminum frame assures style and durability. Accessory tray included. Interlocking Fastener System includes mounting brackets plus Command Picture Hanging Strips to stabilize bottom of board. 4 ft x 3 ft and smaller boards can be hung without hardware on appropriate surfaces. 3M Porcelain Dry Erase Boards are quality boards that are built to last.