This product is a Genuine BMW Fixed Door Window in black, specifically designed for the left side of the vehicle. The part number is 51357179769. It is a fixed window, meaning it cannot be opened or closed. This product is made by BMW and is an authentic and original replacement part for BMW vehicles. It is designed to fit and function seamlessly with the rest of the vehicle's door and window components. This fixed door window is a high-quality and durable product that is built to last.