Erika Sunglasses in BlackUnisex Ray Ban Black Erika RB4171 Sunglasses. The Ray Ban Erika RB4171 sunglasses are a popular frame which has large, rounded lenses and a keyhole nose bridge. The arms are very thin and completed with ear socks, which match the frame colour. The frame is wider on the inside edge at the nose bridge to provide a comfortable and tight fit and the Ray Ban signature is present on the arms and the right lens. The RB lettering is also engraved on the right