The 3M™ Speedglas™ Welding Lens Assembly 9100, is a passive lens assembly designed to be used with the 3M™ Speedglas™ Welding Helmet 9100 Series product line. Passive lens shades available for use with this product are shades 10, 11, 12 and 13.The 3M Speedglas Welding Lens Assembly is designed to help protect the wearers eyes and face from harmful radiation including visible light, ultra-violet radiation (UV), infra-red radiation (IR), sparks and spatter resulting from welding processes.