Forney 57060 Lens Replacement Gold Welding Filter, 2-Inch-by-4-1/4-Inch, Shade-9 Replacement gold coated 4 1/4-Inch x 2-Inch plastic welding filter lens For prolonged periods of welding and/or to see true flame arc and puddle color The gold coating reflects 90-Percent of radiated heat for cooler operation and less eye fatigue Provides 99.9-Percent UV/IR protection Meets ANSI Z87.1 safety standards