Jackson Safety WH25 Duo Series protection lenses are used in the brand's welding helmet to protect the user against dust, dirt, debris and other contaminants from entering the eyes, nose or mouth of the user. These protection lenses have polycarbonate construction for structural rigidity and optical classes of 1 / 1 / 1/2 for clear visibility. They are compatible with AIRMAX PAPR respirators and have a cartridge size of 110 x 90 mm. These lenses offer a viewing area of 92 x 41 mm and come with a shade range between 9 & 13. They come with sensitivity and delay adjustments for enhanced operations.