Ray-Ban Round Metal RB3447 sunglasses pair a slim metal frame with classic round lenses for a vintage-inspired look and dependable sun protection. Key attributes: Gunmetal | Metal | UV 400 protection | Category 3 sun filter | Non-polarized lenses | Adjustable nose pads | Plastic end tips for comfort | Prescription-compatible | Round frame | Curved brow bar | Thin metal temples | Full-rim construction | Dimensions & fit: Lens widths: 50 mm, 53 mm | Bridge: 21 mm | Temple length: 145 mm | Lens heights: 47 mm (50 size), 50 mm (53 size) | Unisex fit | Regular fit; available in 50 mm and 53 mm lens widths | Composition & care: Metal frame | Glass lenses | Wipe lenses with a microfiber cloth; avoid abrasive cleaners and solvents.