The 3mm wide square bangle bracelet is available in three sizes: Small (2.1/2" diameter), medium (2.3/4″), and large (3"). A size medium will fit 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 bangle bracelet is designed in San Francisco and handmade in our Upstate New York production studio.