The ACDelco Spark Plugs P/N: CR43TSM QTY:8 are high-quality platinum spark plugs designed for use in gasoline engines. With a manufacturer heat range of 500°C and a voltage of 6V, these spark plugs provide reliable ignition performance for your vehicle. Made in the United States, these single configuration spark plugs are a crucial component for maintaining optimal engine function. Despite not having a manufacturer warranty, ACDelco spark plugs are a trusted choice for car and truck owners looking for durable and efficient ignition systems.