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 anti-fouling 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: 5. Electrode Tip Material: Nickel alloy. Electrode Core Material: Copper. Insulator Type: Non-projected. Spark Plug Thread Size: 14mm. Spark Plug Reach: 0.460 in. Spark Plug Seat Style: Tapered. Wrench Diameter: 5/8 in. Ground Strap Quantity: One