This Happy Hour Mix-Up is made up of 5 rings including 1 thin silver round, 1 thick gold square, 1 thick 5mm silver round, 1 thin rose gold square, and 1 thick silver round. Special note: Because of the width of our stack ring sets, it is recommended to buy a stack that is approximately a half to a full size larger than your normal ring size. Materials: 14k gold-fill (14k gold over a brass core/no nickel), sterling silver (.925), and oxidized sterling 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 original stack creation was featured during the Ring Bar Happy Houron IG Stories, and is handmade in our Upstate New York production studio.