... Widely used for Auto, Vehicles, Motors and Other Gasoline Engines 2 Durable and safe 3 High quality Spark plugs Features:1 ... , strong resistant to heat shock, great mechanic and electric features and super insulation3 Nickel-plated housing prevents oxidation, corrosion ... sealing6 Copper core electrode prevents oxidation and corrosion, good electric, heat conductivity and long spark plug service life7 ...