Made from polycarbonate material; These filters effectively help protect against the radiation generated in welding operations. This Jackson Safety Passive Welding Filter Lens measures 2 In. by 4.25 In. and features a shade 9 lens; Recommended for arc welding. To prevent surface damage to welding filter plates and auto-darkening lenses, clear safety plates should always be inserted in front of these plates/lenses for better protection. Sold in a case of 25, these filter lens are manufactured for the W10 and W20 Series of Passive Welding Helmets. Established in 1933, Jackson Safety has built a century long reputation for delivering the most innovative safety solutions in the welding and personal protective equipment industries. When it comes to providing safety solutions with long-lasting value, durability and comfort, Jackson Safety has set the standard. Whether the need is for welding protection in a steel fabrication environment, head protection on a construction site, or hearing protection at an airport, Jackson Safety provides the widest range of safety choices to meet the needs of every job and every worker.