This is a DC pin jack connector. The first one is a 3.5mm Male pin and the other one is a 3.5mm Female jack. This type of connector is widely used in our daily life such as computers, speakers, etc. This connector is built from high carbon steel with nickel plating. Hard plastic insulation covers the top and inside part of the connector. The contact material is high-quality copper which helps to prevent data fluctuation. It is durable, easy to use, and can also work in high room temp.