The product is a set of 4 OEM oxygen lambda sensors for a 03-06 Jaguar X100 XK8 XJ8. These sensors are specifically designed for Jaguar vehicles and come with various interchange part numbers, including Denso models. The sensors are of Lambda sensor type and are manufactured with part numbers such as C2C8442, 2R839G444AB, and 1X439F472AC. This set of oxygen lambda sensors is essential for monitoring and regulating the air intake and fuel delivery system in these Jaguar models.