Genuine OEM Volkswagen Protective Sleeve Kit, part number 7E0498201A. This protective sleeve kit is designed to shield the constant velocity joint from contaminants such as dirt and moisture, thereby extending its service life and maintaining optimal function. It is identified as part 21 in the diagram. Genuine OEM protective sleeves are manufactured from specific rubber compounds that resist degradation from road elements and temperature fluctuations, ensuring a reliable seal and preventing premature joint failure.