Highlights Two current paths for reliability and redundancy. -Primary path: Spiral wound stainless steel alloy. -Secondary path: Carbon impregnated fiberglass center core. Low 500 ohm per foot resistance. 7mm Silicone jacket to resist high temperatures, moisture, oil and chemicals. EPDM (Ethylene Propylene Diene Methylene) inner insulation for superior heat resistance and prevention of arcing and voltage leaks. Fiberglass reinforcing braid for added strength and flexibility. Additional Information Now you can get a "stock-look" spark plug wire, that performs! We've designed our 7mm wires with the same core we use in our 8mm wire. The only difference is the 7mm flat black silicone jacket that hides its performance potential from the naked eye. Get the best of both worlds with "state-of-the-art performance and a stock look". These wires will fit most original wire looms. Select a custom tailored set for a great out of the box fit or a universal kit to match your unique engine and wire loom configuration.