The Genuine BMW Roller Sun ScreenTriangular Window Left - 51357304345 is a retractable sun shade designed specifically for the left triangular window of BMW vehicles. It is made with high-quality materials to provide protection from the sun's glare and UV rays, while also maintaining the sleek appearance of the vehicle. The sun screen easily rolls up and down for convenient use and can be securely attached to the window frame. This product is an authentic BMW accessory and is guaranteed to fit and function perfectly in your BMW.