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What are the wires on the earrings? I use niobium ear wires.
Niobium, formerly known as columbium, is a chemical element with symbol Nb (formerly Cb) and atomic number 41. The name comes from Niobe from Greek mythology, who was the daughter of king Tantalus. This was chosen because of niobium's chemical similarity to tantalum. It's also one of the most inert metals, making niobium an ideal hypoallergenic jewelry material for those who have more sensitive skin.