The ACDelco Rapidfire Spark Plug Set includes 8 standard configuration spark plugs designed for gasoline engines. With an installation depth of 4.13 inches, these spark plugs have a manufacturer heat range of 500 °C, making them suitable for a variety of vehicles. The set does not include any vintage parts, and each plug is made with nickel and emits a California Prop 65 Warning. This product is ideal for those looking for reliable ignition system components for their car or truck.