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Ray-Ban Kai Bio-Based are a must-have for those who love metal frames. The oval shape gives them an iconic look, while the solid dark grey lenses add an extra touch of style. With their pale gold metal frame and temples, these sunglasses will have you feeling like you're walking on air all day long. PRODUCT INFORMATION STYLE RB3757 Kai Bio-Based MODEL CODE RB3757 921387 56-15 FRAME DETAILS COLOR Gold MATERIAL Metal SQUARE Oval LENS DETAILS COLOR Dark Grey MATERIAL Polyamide Bio TECHNOLOGY Grey LENS PROTECTION INDEX 3N