This product is a genuine BMW cover for the window frame, C-column, and rear left door in black color. The part number is 51357179413. It is designed specifically for BMW vehicles and is made with high-quality materials to ensure durability and a perfect fit. This cover is an essential component for maintaining the structural integrity and appearance of the vehicle's door and window frame. It is an OEM (Original Equipment Manufacturer) part, meaning it is made by the same manufacturer as the original part installed in the vehicle. This ensures the highest level of quality and compatibility with BMW vehicles.