Ray Ban Sunglasses. Series Round Double Bridge. Series number: RB3647N. Color code: 001/9U. Size: 51. Shape: Round. Lens Width: 51 mm. Lens Bridge: 22 mm. Arm Length: 145 mm. 100% UV protection. Non-Polarized. Frame Material: Metal. Frame Color: Gold. Lenses Type: Silver Gradient Flash. UPC/EAN code: 8053672737646. Ray Ban Round Double Bridge Silver Gradient Flash Sunglasses.