Spell out messages with enclosed letterboards Attractive Satin Anodized aluminum frame Lockable door mounted on full-length piano hinges (two keys included) Shatter-resistant, acrylic windows Illuminated units lit from top Black felt interior is standard 3/4 Helvetica letter and number set included For indoor use only LED Illumination now available - Please call for info Case Dimensions: 1 inch wide main frame 1 7/16 inch wide door frame 2 inch exterior depth