Genuine OEM Audi Inner Gear Synchronizer Ring, part number 02M311277A. This vital component is located within the manual transmission and plays a crucial role in facilitating smooth gear changes. It works by matching the rotational speeds of the input shaft and the gear to be engaged, preventing grinding and wear during shifting. Made from a durable brass or bronze alloy, it is designed for high friction and wear resistance. Using a genuine OEM synchronizer ring ensures precise dimensions, correct material composition, and long-lasting, smooth transmission performance.