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By certification 
Characteristic
Sphere shape is the special one of NdFeB magnets with special processing. They are usually used in the magnetic toys (like Rubik's cube magnetic ball), tweeter and so on.
Appearance: Smooth and bright surface without burrs.
Customized service
Grades: N30~N54, N30M~N52M, N30H~N52H, N30SH~N48SH, N25UH~N45UH, N28EH~N40EH, N28AH~N40AH
Size: According to customer requirements.
Coating: Conventional nickel-copper-nickel, blue-white zinc, phosphating/passivation, epoxy (phosphating, nickel-copper, nickel-copper-nickel base)
Application
Mainly used in magnetic toys (such as magic cube magnetic ball), decoration, etc.
http://www.yanhemagnet.com/
