3M Porcelain Dry Erase Board, 48 x 36-Inches, Widescreen Aluminum Frame Ultra-durable, premium porcelain will not scratch, dent, stain or ghost under normal usage. Magnetic surface; Galvanized steel backing for extra durability. Includes easy snap-on accessory tray 3M Durable Porcelain Dry Erase Board. Galvanized steel backing Mounting System utilizes Command(TM) picture hanging strips for easy mounting Frame is attached to backing using screws for additional durability Magnetic. Galvanized steel backing