The Set of 8 Spark Plugs V-Power NGK 3951 TR55 is a high-quality secondary ignition system component designed for gasoline engines. Manufactured by NGK, a trusted brand known for their reliable spark plugs, these plugs feature a 14mm thread diameter and standard configuration. With a voltage requirement of 8V, these spark plugs are made of durable nickel and copper materials, ensuring optimal performance and efficiency. The pack includes 8 spark plugs with the manufacturer part number 3951, interchange part numbers NGK 3951 TR55 and TR55, and OE/OEM part numbers TR55 and 3951. Ideal for car and truck maintenance, these spark plugs are a crucial part of the ignition system.