Genuine BMW Accessory Engineered specifically to work with your BMW's Tire Pressure Monitoring System Designed with a rubber "O" ring which ensures the valve orifice is kept clean and dry, providing for a tight seal. Made of inert materials that will not interact or "seize" onto standard BMW valve stems Full color logos are sealed in a UV resistant clear dome ensuring they will not fade or yellow over time These custom molded N2 nitrogen valve stem caps are engineered specifically to work with your BMW's Tire Pressure Monitoring System. They are designed with a rubber "O" ring which ensures the valve orifice is kept clean and dry, providing for a tight s