This product is a Genuine VW/Audi Brake Kit designed specifically for the rear brakes of a car. It includes four different components, each with their own unique function. The first component is a set of brake pads, which are responsible for creating friction against the rotors to slow down or stop the vehicle. The second component is a set of brake rotors, which are the discs that the brake pads press against to create the necessary friction. The third component is a set of brake calipers, which are responsible for holding the brake pads in place and applying pressure to them. The final component is a set of brake sensors, which are designed to detect when the brake pads are getting too worn and need to be replaced. This kit is specifically designed for use with VW and Audi vehicles, but can be used with other compatible makes and models.