Genuine OEM Audi Joint Sealing Sheath, part number 5Q0498202A. This sealing sheath, also known as a dust boot or CV boot, is designed to protect the constant velocity (CV) joint from external contaminants like dirt, water, and debris. It is crucial for maintaining the lubrication within the joint and preventing premature wear. Made from high-quality, flexible rubber that can withstand road conditions and temperature fluctuations. Genuine OEM parts ensure the exact fit and material properties necessary for effective protection of drivetrain components.