Fiber-Metal face shield windows are injection molded from propionate, which is superior to other window materials in every significant performance characteristic. They are preformed at the factory to the exact curve of our crown protectors for easy installation an exact fit and a perfect seal against dust, dirt and debris. All HIGH PERFORMANCE windows are .060" thick for an extra margin of protection yet they cost no more than ordinary .040" thick windows. Available in three sizes, in clear and three special tints, HIGH PERFORMANCE windows provide a degree of protection and a price point for every application and budget. IR/UV Face shield Windows offer the same performance characteristics as clear with the industry's leading infrared/ultraviolet absorber added to achieve shade 5 filtration. Use for oxyfuel welding and cutting, plasma arc cutting and brazing applications. (Not suitable for electric arc welding).