3x D9/D10/D11/D12 108x83x3mm Welding Helmet Shade Dark Glasses Lens Film Filter

The number denotes the amount of shade provided by each lens, number bigger, more darker, you should select the one that is most comfortable yet provide clear visibility. All of the colour lenses are German Din standard and filter out harmful ultraviolet and infrared wavelengths, to provide full protection for your eyes.