This lens protects the inner lens from scratching or cracking. Provides this protection while not inhibiting the operator’s vision. For optimum protection always use inner and outer lenses. In addition, using genuine lenses provides further protection. This is because non-OEM lenses are often non-conforming with NIOSH standards. Lens dimensions – 5″x 14″. Transparent lens. However, shade and yellow tinted lenses are available. Lens thickness – 0.040″. Lens material – Acetate. Pack of 25.