Running a "W" series Tractor in competition? We have the "hotrodders" of Tractor pulling covered with these 8mm "Ultimate Power" Spark Plug wires! Ready to take on any ignition enhancers, MSD's or whatever ignition you want to throw at em' they'll handle the power!  For Distributor fired Tractors. Made with high performance Carbon Core wire for competitors running electronic ignition so as not to blow the E.I. module out due to a stray spike from solid core wires.   8mm Ultimate Power wires!