NGK V-Power spark plugs offer economical performance for nearly any automotive application-and they're the only plugs with NGK's V-Groove technology. These plugs enhance ignitability, lower the voltage requirements of ignition systems, and have strong characteristics, while improving fuel mileage and acceleration performance. The V-Power plugs are also highly durable against electrical and chemical wear, making them long-life replacement plugs. Because of the V-Groove, the spark occurs at the edge of the center electrode-so heat is not absorbed by the electrode itself. This allows the flame kernel to expand quickly and efficiently for a complete burn and great performance. Shorty Spark Plug: No Resistor: Yes Manufacturer Heat Range: 4 Electrode Tip Material: Nickel alloy Electrode Core Material: Copper Insulator Type: Projected Spark Plug Thread Size: 14mm Spark Plug Reach: 0.750 in. Spark Plug Seat Style: Gasket Wrench Diameter: 5/8 in. Ground Strap Quantity: One