Engine H4, Engine Size 2.5L/2498cc Engine Family 4-cylinder Trivalent metal plating provides superior anti-corrosion and anti-seizing properties. Corrugated ribs prevent flashover. Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer. Copper core aids in heat removal. Triple seals prevent leakage Sold In 4 Pack Often specified as original equipment, NGK Laser Iridium spark plugs are the best combination of performance and longevity. Iridium tip is six (6) times harder than platinum providing the strongest ignitability and the longest life possible. Most Laser Iridium spark plugs feature a platinum pad on the ground electrode for even wear in DIS ignition systems. OE engineered for specific vehicle applications. Shorty Spark Plug: No. Resistor: Yes. Manufacturer Heat Range: 7. Electrode Tip Material: Iridium. Electrode Core Material: Copper. Insulator Type: Extended Projected. Spark Plug Thread Size: 18mm. Spark Plug Reach: 1.040 in. Spark Plug Seat Style: Gasket. Wrench Diameter: 14mm. Ground Strap Quantity: One