Ray-Ban RB4171 ERICA Unisex Gradient Aviator Sunglasses (Rubber Black Frame, Grey Gradient Lens 622/8G) Imported Composite frame gradient lens non-polarized Lens width: 54 Bridge: 18 millimeters Arm: 145 millimeters Model: RB4171 ERICA. Original Ray Ban Packaging, Case and Cleaning Cloth included. Gender: Unisex. Plastic Lens/ Polarized Lens/ Metal Frame