This product is a pack of four Motorcraft SP-518-A spark plugs designed for use in Ford vehicles. Spark plugs are an essential component of the ignition system in gasoline engines, responsible for creating the spark that ignites the fuel-air mixture in the engine's cylinders. These spark plugs are made to meet the specifications and quality standards of Motorcraft, a brand known for producing reliable and durable automotive parts. The product includes four spark plugs and is compatible with a range of Ford models.