The interior is self-adhesive fabric and the sliding glass doors give the board an optimum viewable area for displaying any kind of sign, announcement, instruction, artwork, and much more. The sliding glass doors are tempered and include a ratchet lock and two keys.Open Faced Easy Tack Board,60"x36",Grey Fabric/Bronze Easy Tack Sliding Glass Boards are ideal for educational institutions, businesses, organizations, community centers, and much more..