Champion Copper Plus(R) provides dependable performance and durability.; Provides longer life with copper core center electrode allows for accurate control of heat range; Copper core center electrode also optimizes the performance and longevity of the spark plug; Built to ISO and SAE standards for proven performance; TinTac(R) and ULTRASEALTMeliminates the need for use of anti-seize compound by providing the best corrosion protection of any spark plug UPC: 037551000203 Center Electrode Core Material: Nickel / Copper Alloy Center Electrode Tip Material: Nickel / Copper Alloy Drive Size: 5/8 in Ground Electrode Tip Material: Nickel Copper Alloy Insulator Material: Zirconia Insulator Type: Projected Internet Product Code (IPC): 19C990E2486 Item has MSDS (SDS)?: N Manufacturer Heat Range Number: 12 MFG Brand Name: Champion Spark Plugs MFG Model # (Series): 406 MFG Name: Federal-Mogul Motorparts Resistor: Yes Seat Style: Tapered Supplier Company Name: Federal-Mogul Motorparts Thread Size: 14 mm