14k hollow gold Outer diameter: Small: 20 mm, 0.79 inches Medium: 30 mm, 1.18 inches Large: 40 mm, 1.57 inches Width: 5 mm Friction back closure Sold as a pair Ring Concierge, Bespoke Rings, Gold Rings Jewelry, Bridal Engagement Rings, Luxe Gifts, Mens Band, Fine Jewelry Collection, Bridal Gifts, Wedding Ring Bands