This rounded stack has five rings including 1 thick (3mm) silver, 1 thick rose gold, 1 thick silver, 1 thin silver and 1 thin rose gold. This ring is available in sizes 5.0 – 11.5, including all half sizes. Special note: because of the wideness of the stack ring set, it is recommended to buy a stack that is approximately a half size larger than your normal ring size. Materials: sterling (.925), 14k gold and rose gold fill (14k gold over a brass core, no nickel), hypoallergenic. This ring set is handmade in our California and New York production studios.