This case of 36 PETG face shield windows works with the C10 Bump Caps that have the face shield attachment without any additional tools being required. The clear, PETG (thermoplastic polymer resin) window allows maximum light transmission; The face shield is designed for protection when working near welding applications or, high impact work areas. Protective eyewear should be worn under face shields at all times; An affordable, disposable and recyclable face protection, each window measures 6" x 15.5" x 0.040". 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.