Mirror frame is fabricated of stainless steel 22 gauge (.8mm) one piece roll formed channel 1/2" (13mm) x 1/2" (13mm) x 1/2" (13mm), with mitered corners. Frame is polished to a bright finish and has a removable protected vinyl coating. Back panel is fabricated of galvanized steel with lock tab and slots formed to receive wall hanger tabs. Shock absorbing material is placed between mirror and back panel. Mirror glass if first quality, electrolytic copper back, 1/4" (6mm) plate/float glass. Guaranteed against silver spoilage for 25 years. Meets and exceeds federal speculations DD-M-00411B & C.S. 27.