Ray-Ban RB4171 ERICA Unisex Aviator Sunglasses Imported Composite frame plastic 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