The E3.68 E3 Premium Spark Plugs are a high-quality, durable option for your vehicle's ignition needs. These spark plugs feature a ceramic core material and a 14mm x 1 thread size, ensuring a precise and secure fit in a variety of import and domestic applications. The E3.68 spark plugs are widely stocked in automotive retail stores and are backed by a guarantee of five years or 100,000 miles. The unique DiamondFIRE electrode design increases power, reduces fuel consumption, and improves hydrocarbon emissions over time. With a resistor and gasket seat, these spark plugs offer excellent heat transfer and create more turbulence in the cylinder for optimal performance. The package includes eight spark plugs.