Plastic frame Plastic lens Non-Polarized UV Protection Coating coating Bridge: 17 millimeters Mc Fly 100% UV Protection 6 Base Polycarbonate Lenses 6 Base Injected Frame Comes with Black Flys zip case and microfiber soft bag Black Flys nylon frames are constructed around a wire core, keeping the shape consistent in extreme conditions. They are injected of the highest quality nylon available and feature optical quality polycarbonate lenses.