Spark plug wires are the heavily insulated wires that carry high voltage from the ignition coil to the spark plug to ignite the fuel air mixture in the cylinder. Thundercore Ultra Wire Sets are made to the highest quality standards. They meet or exceed Original Equipment specifications in regards to fit, form and function. The cable is wire-wound, multi-insulated, and SAEJ2031 Class E rated. The coil on plug boots are made with a high temperature silicone. They also feature premium corrosion-resistant snap lock terminals that click into place for easy installation and removal. Walker Products began supplying the fuel system needs of the automotive industry in 1946. Today Walker is one of the largest, privately owned manufacturers of fuel system components and engine sensors, and has served the needs of the worldwide automotive aftermarket. We are committed to supplying products manufactured to meet or exceed OEM standards and specifications. This effort is backed by our own manufacturing, product management and engineering staff to ensure it is maintained and accurate in the production of quality parts, vehicle applications, instruction sheets and technical support. Our products include Carburetor and Fuel Injection Repair Kits, Oxygen Sensors and other Engine Management products such as Throttle Position Sensors, Cam and Crankshaft Sensors, Fuel Injectors, Spark Plug Wires and Gaskets. As an ISO 9001: 2008/TS16949 certified company, we are committed to supplying the highest quality products.