Made of Quality Rhodium Plated. Hypo-allergenic and will not oxidize over time. Does Not Contain Carcinogenic Substances such as Nickel, Cadmium, Lead. It stays bright for long time and is not harmful to humans. These were designed specifically for both comfort and durability. It is recommended to be used by protecting from chemical products (cream, shampoo, perfume, etc.) and resting for long-term use.