Our Niobium Dangle Earrings feature dangles made from varying materials hanging on Niobium ear wire hooks. Pure Niobium is sometimes denoted as 999 Niobium. It is naturally nickel free, chromium free, and cobalt free. Niobium is ultra comfortable and often people remark that they forget they are even wearing earrings while they are wearing Niobium. These earrings come with plastic safety nuts to keep your ear wires securely in your ears.