... to make into super hard micro magnetic precision parts for timekeeper, micro-motor, optical communication electronics, electroacoustics, digital camera etc.4. ... need any electroplating at all, it can widely applied in motor, meter, sensor, radar, magnetic drive and other high-tech ... 'gem-bearings.2. Rotor magnet used for quartz watch or electrical meter counting step motor Products'sizes:outer dia. 0.5 ...