Hardwood frame with an attractive stain Black felt letterboard interior is standard Secure, shatter-proof acrylic doors Solid disc tumbler locks protect against vandalism (two keys included) 3/4 Helvetica letter and number set included For indoor use only LED Illumination now available- Please call for info Case Dimensions: 3/4 inch wide master frame 1 inch wide door frame 2 inch exterior depth 4 inch illuminated exterior depth