These top quality lobster clasps are made of solid gunmetal plated brass. They are also hypoallergenic, as well as also lead- and nickel-free. They are plated in a beautiful shiny black gunmetal finish. Matching ear hooks, jumprings and other findings can be found in the shop to complete a fully coordinated piece. These are high quality clasps that hold up to being opened and closed. I've never had one break on me yet!