AMV 9FAMV magnesium wheels are the result of years of research and development in magnesium casting. These wheels are casted with the new AMV low pressure machine, using 100% pure AZ91 magnesium. This allows us to assure no air leaks, even without any powder coating on the wheel surface like other brands. This improves the heat transfer, which is not impeded by any additional surface coatings. All this helps to stabilize the tire temperature and pressure