Ray-Ban's Gunmetal Rb3138 sunglasses offer 100% UVA and UVB protection, and polarized lenses. These Ray-Ban sunglasses are designed with rectangular, metal frames that are gray in color and compliment the lovely green lenses. Ray-Ban Gunmetal Rb3138 sunglasses have a 125mm temple length and part of Ray-Ban's sports line for men. As an accessory item, Ray-Ban Gunmetal Rb3138 sunglasses combine style and function.