This long tri-toned U necklace is adjustable, and can be worn at 37.0″. The pendant piece is 7.1/8" by 1/8" and also has a 4.0" by 1/8" back plate that is designed to hold the necklace in place on the back of your neck. Materials: 14k gold-fill or rose gold-fill (14k rose gold over 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 necklace is designed in San Francisco and handmade in our Upstate New York production studio.