All Earrings Backs are Made by 925 Sterling Silver Plated By 18K White Gold . Super Security, Convenience And Comfort for Your and Your Earrings. Idea Back for Studs Earrings and for Woman Men but not for Children Use, the Size of Earrings Backs are Pretty Big . Nickel Free, Lead Free, Non-irritating for Sensitive Ears, Hypoallergenic. Keeping Eearring Backs Duarable & Shinning Forever.