This pack of four DENSO spark plugs, model 3133 and part number KJ20CR11, is a great choice for your ignition system. Made in Japan, these spark plugs have a thread diameter of 14mm and a voltage of 12V. They are designed for gasoline fuel type and are compatible with standard configuration. The brand DENSO is known for its high-quality car and truck parts and accessories, and these spark plugs are no exception. Although they are not vintage, they are still a reliable and efficient choice for your vehicle. Whether you're replacing a worn-out spark plug or upgrading your ignition system, these DENSO spark plugs are a great choice.