Our Athermal Green/Gray Welding Lenses are of the highest quality glass, made by Schott Glass in Germany. This glass is unlike the Chinese glass on the market today; it has none of the distortions, color variations, striations, bubbles or inclusions that are prevalent in most Chinese welding glass lenses. It offers excellent UV and IR protection while reducing eye strain from its lack of distortion. Available in shades 4-14.