This 2.5mm wide gibbous cuff bracelet is now available in three sizes: small, medium and large. A size medium will accommodate the size of most wrists. Materials: 14k gold-fill (14k gold over brass core/no nickel), sterling silver (.925) or oxidized silver. All materials are hypoallergenic. The black (oxidized) components of our jewelry will wear over time and eventually achieve a beautiful antique-like finish. This cuff bracelet is handmade in our Upstate New York production studio.