For use on cars and light commercial vehicles, these high quality copper coated aluminium cables are colour coded (Red = positive, Black = negative) and feature fully insulated clamps. 400A: 16mm2 diameter cable suitable for use on up to 2.5L petrol/1.5L diesel vehicles 500A: 25mm2 diameter cable suitable for use on up to 5.5L petrol/3.0L diesel vehicles Storage bag supplied.