Ray Ban Sunglasses. Series Round. Series number: RB3447. Color code: 002/4O. Size: 50-21. Shape: Round. Lens Width: 50 mm. Lens Bridge: 21 mm. Arm Length: 145 mm. 100% UV protection. Frame Material: Metal. Frame Color: Black. Lenses Type: Gradient Mirror Blue. Rim Style: Full-Rim. UPC/EAN code: 8053672561531. Ray-Ban Round Blue Gradient Flash Sunglasses RB3447-002-4O-50.