Ferrule Copper Crimp Connectors AWG16, 1.5mm? Black Insulated Crimp Pin Terminals Nylon Copper Crimp Ferrules Wire Connector Sleeves. These wire connectors are made of quality brass and tin-plated copper surface, silver plated,anti-oxidation,anti-corrosion. With the properties of flame retardancy, good insulation and conductivity, can serve a long-lasting use. These electrical wire ferrules are suitable for electricians, and can be applied to furniture, power distribution cabinets, and car audio equipment and household appliances.