These high quality protective caps are Perfect for either shorting and non-shorting applications. They can avoid the sockets from dust and dirt and prevent the socket from rust in order to maintain the best conductivity. The Cap Plugs is Made of copper, beautifully finished in heavy gold plating. It can effectively prevent and RF electromagnetic interference, and improve the purity of the system sound. Shorting and non-shorting application (removable center pin). Colour:gold Material:Gold-plated copper Package Contents: 10 x Gold Plated Cap Plug Short-Circuit Socket Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.