Ray Ban Sunglasses. Series number - RB2180. Color code - 616613. Size - 51. Shape - Round. Lens Width - 51 mm. Lens Height - 49 mm. Lens Bridge - 21 mm. Arm Length - 150 mm. 100% UV protection. Frame Material - Plastic. Frame Color - Turtledove. Lenses Type - Brown Gradient. Lenses Type - Brown Gradient. UPC/EAN code - 8053672546989. Ray Ban Brown Gradient Round Men's Sunglasses RB2180 616613 51.