This product is a Genuine BMW Channel Cover Outer Door Rear Left (Alu Satiniert) with the part number 51357317839. It is made of high-quality materials and is designed specifically for BMW vehicles. The channel cover is located on the outer side of the rear left door and has a sleek Alu Satiniert (satin aluminum) finish. This product is an authentic BMW part and is perfect for replacing damaged or worn out channel covers on your vehicle.