Black & Red color make you easy to recognize positive and negative and directly connect on each terminal The main components of the battery pile head is made of copper. Attachment screw and nut are not copper. Suitable for most vehicles Copper material has good conductive performance, good flexibility The pile head will not break, corrosion resistance, can reduce the voltage distortion and the current transmission loss. Corrosion resistance, good conductive performance, wiring is convenient, and the connection is firm.