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Stainless Steel, high quality, strengthened hinges. 100% UV Protection, with high quality polycarbonate for a more optically correct lens. Polycarbonate is light weight and provides high impact resistance. Polarised polycarbonate lenses block out 99% of the polarised light waves, (water, snow and the road), while also blocking 100% of the harmful UV (UVA UVB & UVC) rays. High quality polycarbonate memory flex injected frames. Filtrate uses only high quality materials in all our frames to survive the good times and the bad. 6 - 8 Base frame curvature of the lens and/ or frame of a sunglass.