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 and contain 15% recycled content. 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.