The product is a set of four DENSO Platinum Titanium TT Performance Power Spark Plugs, specifically the PK16TT model with a 14mm thread diameter. These spark plugs are designed for gasoline engines and manufactured in Japan. They are made with platinum material and come with the OE part numbers 4503. The product also includes interchange part numbers for various vehicle models and a manufacturer part number of 4503-Set4. The spark plugs are high-quality components designed to enhance the performance of the ignition system in cars and trucks.