This product is a genuine BMW inner weatherstrip for the rear left door. It is designed to seal the gap between the door and the body of the car, providing protection against weather elements such as rain, wind, and debris. The part number for this weatherstrip is 51357258297. It is specifically designed for BMW vehicles and is made with high-quality materials to ensure durability and a perfect fit. This weatherstrip is an essential component for maintaining the integrity of the vehicle's interior and protecting it from outside elements.