1) 216 pcs per set in one tin box 2) New colors:RED, ... elementsHigh remanence, high coercive force, high energy, etcHigh resistance to magnetic demagnetizationNew colors offered :RED,BLUE,GREENCD provided for teaching how ... used in mini-motors, wind generators, meters, sensors, speakers, magnetic suspension system, magnetic transmission machine and other industrial applications.Very easy to corrosion ...