This product is a genuine BMW cover for the window guide web on the interior left side. It has a part number of 51348159881 and is designed specifically for BMW vehicles. It is made of high-quality materials and is an exact replacement for the original part. This cover helps to protect the window guide web and keep it in place, ensuring smooth operation of the window. It is a durable and reliable product that is essential for maintaining the functionality and appearance of your BMW.