Enclosed Cabinet Letter Boards for indoor use feature ¼” grooved changeable flannel letter panels. The units feature durable anodized aluminum frames. A set of 3/4" Gothic style white letters, numbers and characters is included. Lockable full-length hinged doors, with shatter-resistant acrylic. Headers include a 6” high opaque acrylic panel with uppercase and lowercase Helvetica black letters. Units feature concealed corner brackets for mounting. Backed by Ghent’s 10-year guarantee.