The product is a 4 pack of DENSO 90919-02258 ignition coils specifically designed for the Corolla 1.8L engine. These coils are manufactured in Japan and come with a 1-year manufacturer warranty. They are performance parts that are suitable for vehicles with 25,000-49,999 miles of mileage. The coils are of different types including Stick Coil, Coil on Plug (COP), and BLK Coil, and they do not require an external resistor for operation. They are designed for specific placement on the vehicle, such as upper, lower, front, rear, left, and right. The product offers same-day shipping.