Fuse Lenses for Spy Optic Dirk Plastic frame Plastic lens Non-polarized lenses Lens width: 64 millimeters Fuse Grey Tinted Lenses. Grey tint gives true color perception. Enhanced depth perception. Non-polarized lenses Completely block harmful UV rays, providing 100% UV protection Fuse Force scratch resistant hard coating Lens Category 3, Ideal for Bright Light Custom Made to easily interchange with your current sunglasses.