This 3mm wide cuff is available in one size, which will accommodate the size of most wrists. Materials: oxidized sterling silver (.925) and 14k gold or rose gold-fill (14k gold over a brass core/no nickel). The black (oxidized) components of our jewelry will wear over time and eventually achieve a beautiful antique-like finish. All materials are hypoallergenic. This cuff is handmade in our California and New York production studios.