Ray-Ban Sunglasses | Rayban RB3421 from £85 - Buy with confidence from Authorised Rayban retailer. The Ray-Ban RB3421 is a new modern style rectangular sunglass from Ray Ban, with plastic wider side detail. The RB3421 are metal designer sunglasses with plastic sides by Ray Ban. The RB3421 has a full rim and single bridge for a classic, but modern Ray Ban look, and is available in 6 colours, and two sizes. The Ray Ban RB3421 comes complete with Ray-Ban case and cloth.