Permanent Ring magnets: Super strong magnetic force and high intrinsic coercive force make it an ideal and irreplaceable kind of magnet in the magnetism world. Super strong magnetic force and high intrinsic coercive force make it an ideal and irreplaceable kind of magnet in the magnetism world. It has universally been used in wind generators, vibration motors, DC motors, servo motors, linear motors, VCM, MRI, electronics, aviation, cars, medical equipments, loudspeakers, transmission machine, Household appliance...And even in many details of our everyday life.