The AKG-5+ Holmium/Yag/Co2 is a laser safety lens made of a light blue AKG5 glass filter. It is cut and mounted into model 16001, which is a plastic wrap around frame made out of TR-90 Nylon with incorporated side face protection. The unique shape of the lenses and the comfortable adjustable nose pads, offer a sleek and lightweight feel to these stylish Black/Blue safety frames. ANSI Z87 Safety Approved.