NGK 3199 Spark Plug, (Pack of 1) Corrugated Ribs to Prevent Flashover; Pure Alumina Silicate Ceramic Insulator, Providing Superior Strength and Better Heat Transfer Copper Core to Aid in Heat Removal; Triple Seals to Prevent Leakage Multi-Ground; Platinum Center Electrode; Nickel Ground Electrode Resistor Value: 5K Ohm