Bosch Nickel With Copper Core Spark Plug - 79026 Part #: 79026 Line: BOS Bosch Nickel With Copper Core Spark Plug 1 Year Limited Warranty Seat: Gasket Thread Size: M14 Heat Range: 8 Resistor Plug: Yes Center Electrode Core Material: Nickel-Chromium Alloy, Copper Center Electrode Tip Material: Nickel Approximate Resistor Value (Ohm): 10000 Ohm Ground Electrode Tip Material: Nickel Thread Reach (mm): 12.7mm Metallurgy: Copper Show More Show Less