Enhance the performance of your vehicle with this pack of six genuine OEM AC Delco spark plugs. Designed for gasoline fuel types, these standard configuration R43CTS spark plugs are made of durable steel and manufactured in the United States. The manufacturer part number 5613810 ensures compatibility with your vehicle's ignition system. Enjoy smooth and efficient operation without worrying about the condition of your spark plugs. Upgrade your ignition system with these reliable AC Delco spark plugs today.