14k hollow gold Outer diameter: Small: 20 mm, 0.79 inches Medium: 30 mm, 1.18 inches Large: 40 mm, 1.57 inches Width: 4 mm Friction back closure Sold as a pair Bespoke Rings, Bridal Engagement Rings, Mens Band, Fine Jewelry Collection, Luxe Gifts, Bridal Gifts, Ring Bracelet, Wedding Ring Bands, Jewelry Care