High performance 8mm silicone jacket wire offers lower 500 ohms resistance for increased HP Thick fiberglass construction with extra silicone exterior insulated sleeve 2000 degree rated ceramic plug side boot Black Color 1 year manufacture warranty Ton's Performance Spark Plug Wires for V8 Gasoline 445 Cubic Inch CI CID 7.3 Gas Gasoline Engine compatible with Godzilla Found in Ford Heavy Duty Trucks F-250 F-350 F-450 F-550 Econoline F53 Cab and Chassis / Cutaway Motorhome Camper Chassis. These are high performance replacement spark plug wires for 2020+ Ford 7.3L engines. Ton's Performance wires are built with a spiral wound alloy conductor with a high dielectric insulator, and 2 layers of silicone with final thickness of 8mm to protect against heat and tears. Additional yellow fire sleeve added for extra protection, total overall thickness of 17mm. Ton's is one of very few companies that offers custom wires for many different applications in the aftermarket motorsports world.