The SplitFire Spark Plugs SF392D Pack of 4 is a set of high-quality spark plugs designed for vehicles. Made by the brand Split-Fire, these spark plugs are constructed with durable copper material for reliable performance. With manufacturer part numbers 2546 and SF392D, these spark plugs are essential components for maintaining the ignition system of a car or truck, ensuring optimal engine function and efficiency. Upgrade your vehicle's spark plug system with this pack of 4 SplitFire spark plugs for improved performance and durability.