Sterling Silver Lobster Clasp: Sterling silver lobster clasp for chain extersion, with unique white gold finishing, will work with many different kinds of chains (0.55"x0.24").Sterling Silver Necklace Clasp: Solid 925 sterling silver, 925 stamped, sterling silver is hypoallergenic and nickel free, a good choice for those who have sensitive skin.Wide Application: Can be used with a variety of necklace and bracelet exterders, customize your unique jewelry. Ideal for DIY handmade craft. Meet your different needs.Note: The oxidation of sterling silver is a natural process. We recommend regular cleaning to help prevent discoloration and maintain its luster. We present a silver wiping cloth with the package.100% satisfied: If you are not satisfied with the order, please contact us. We will reply within 24 hours and try our best to solve it.