This product is a Genuine Porsche Door Mirror Glass, with part number 99173103504. It is a replacement glass for the door mirror of a Porsche vehicle. It is an authentic, high-quality product made by Porsche and is designed specifically for use in their vehicles. This mirror glass is compatible with various models of Porsche cars and is made to the same specifications as the original mirror glass. It is a durable and reliable product that will provide clear and accurate reflection for safe driving.