... 2)nickel,black,silver,gold 3)SGS certified Features of magnetic sphere:1)Mateials: NdFeb magnet2)Colors: nickel, black, ... :216 pcs/set4) Packing:Round steel box packing1. The magnetic sphere has high remanence, high coercive force, high energy ... and Micro products, such as Motor, sensors, loudspeaker, windmill, Auto, National defence, Speaker, Computer, Biology project, Medical treatment, Instrument ...