Lead-free premium alloy with .005% of silver, which is strong and durable. Rhodium, a derivative of platinum, is a permanent, non tarnishing finish that is hard, bright and durable and compliments well with 14kt Gold. Contains .02% nickel. Most earring posts are surgical steel, which are ideal for sensitive ears prone to infection or allergies. (French Wire Clip Earrings are plated and contain nickel)