Allows for easy updates and offers easy visibility Great for information centers. Radius-corner aluminum frame features a graphite color and powder-coated finish for durability. Shatter-resistant acrylic windows keep messages safe. Doors lock for security and hang on full-length hinges for easy opening/closing. Security-lock mounting system prevents theft and vandalism. Molded magnetic letters sold separately. For indoor use only. Quartet(R) Enclosed Magnetic Letter Board, 48in. Made by Quartet.