The Set of 4 NGK 3951 V-Power Premium Copper Spark Plugs TR55 is a high-quality product designed to enhance the ignition system of your car or truck. These spark plugs offer improved performance and reliability, thanks to their premium copper construction and NGK brand reputation. With a voltage of 4V and a manufacturer part number of 3951, these spark plugs are a great choice for maintaining optimal engine function. The set includes eight plugs to ensure you have a spare on hand for any unexpected needs.