Ray Ban Sunglasses. Series Erika. Series number: RB4171. Color code: 865/13. Shape: Round. Lens Width: 54 mm. Lens Bridge: 18 mm. Arm Length: 145 mm. 100% UV protection. Non-Polarized. Frame Material: Nylon. Frame Color: Tortoise; Gunmetal. Lenses Type: Brown Gradient. UPC/EAN code: 805289742470. Ray-Ban Erika Brown Gradient Sunglasses RB4171 865/13 54.