These inner cover lenses provide secondary protection for your welding helmet's optical system. The 104x96mm size fits GYS and many other European-style helmets. The crystal-clear polycarbonate offers excellent optical clarity. The anti-static coating resists dust accumulation. The 1.0mm thickness provides durability without adding weight. Sold in economical 5-packs for regular maintenance. Each lens is individually inspected for imperfections. The easy-install design snaps into place without tools. Compatible with most auto-darkening filter units. Replace when scratches or haze begin to affect visibility. Helps maintain optimal weld pool visibility throughout the lens's service life.