This rigid square stack has three rings: 1 thick (3mm) silver, 1 thick (5mm) silver, and 1 (2mm) gold band. It's rigid, yet extremely comfortable due to it's softly rounded edges. This ring is available in sizes 5.0 – 9.5, including all half sizes. 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. 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.