NGK Laser Iridium spark plugs provide superior ignitability and long service life. Fine wire iridium tipped center electrode and fine wire platinum tipped ground electrode ensures slow wear rate providing stable idle, superior anti fouling, improved fuel efficiency and lower emissions. Specifications: Shorty Spark Plug: No Resistor: No Manufacturer Heat Range: 6 Electrode Tip Material: Iridium Electrode Core Material: Platinum Insulator Type: Non-projected Spark Plug Thread Size: 14mm Spark Plug Reach: 26.5mm. Spark Plug Seat Style: Gasket Wrench Diameter: 16mm. Ground Strap Quantity: One Quantity: Set of 4. What's in the box Set Of 4 Spark Plugs