These are our "Ultimate Power" 8mm Spark Plug wire set for the "W" series Tractors equipped with either the 201 or 226 engines that are competition pullers! Cut and numbered for each cylinder, these wires can handle as much current as you can put through them! They are also Carbon Core which can be used with Pertronix electronic ignition kits along with any ignition enhansers. Quality Spiro Pro Taylor wires are tops in their field. Don't guess. Go with the best! B&B "Ultimate Power" wire sets made right here in our shop!