Kit Content:8 x NGK Nickel Ruthenium HX Spark PlugsItem Description:Resistance(Ohms): 5000Seat Type: FlatGround Electrode Tip Design: Dual Fine Electrode - High IgnitabilityManufacturer Heat Range: 6Pre-Gap Size(in): .044Hex Size(in): 5/8Insulator Height(mm): 50.50Ground Configuration: StandardGround Electrode Core Material: NickelReach(mm): 26.5Center Electrode Tip Material: RutheniumElectrical Terminal Type: Non-Removable NutGround Electrode Quantity: 1Center Electrode Core Material: CopperThread Diameter(mm): 14.00