This tri-toned square ring set includes 6 rings: 1 thick silver, 1 thick gold, 1 thin silver, 1 thin silver and 2 thin oxidized. Our square stack rings are rigid, yet extremely comfortable due to their softly rounded edges. This set is available in sizes 5.0 - 9.5, including half sizes. Special note: Because of the width of our stack ring sets, we recommend purchasing a stack that is approximately one half to a full size larger than your usual ring size. Materials: 14k gold or rose gold-fill (14k gold over a brass core/no nickel), sterling silver (.925), and 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. Thing ring set was designed in San Francisco and handmade in our Upstate New York production studio.