3.5mm mono plug to 3.5mm mono jack adapter 3.5mm mono plug to 3.5mm mono jack converts 3.5mm mono plug to a 3.5mm mono plug.The adapter is assambled of black molded plastic with nickel-plated contacts.Black molded plastic construction nickel-plated contacts connector 1: 3.5mm mono plug connector 2: 3.5mm mono jack body diameter: 10mm