This product is a genuine disc brake caliper piston seal designed specifically for use in Volkswagen and Audi vehicles. The part number for this seal is 4E0698507. It is used to seal the piston in the brake caliper, ensuring proper functioning of the brakes. This seal is an authentic OEM (Original Equipment Manufacturer) part, ensuring high quality and compatibility with the vehicle. It is a crucial component in maintaining the safety and performance of the braking system.