This mixed metal ring (set of 7) consists of three different gauges and metals: 2 thick gold, 3 thin silver and 2 thin gold. This ring is available in sizes 4.0 – 11.5, including all half sizes. All larger sizes will incur an extra materials fee. Special note: because of the wideness of the stack rings, it is recommended to buy a stack that is 1/2 size larger than your “normal” ring size. Of course, if you order a ring and the fit is not quite right, we are more than happy to exchange it for the correct size. Materials: sterling silver (.925) and 14k yellow gold-fill (14k yellow gold over a brass core/no nickel). All materials are hypoallergenic. This ring is handmade in our California and New York production studios.