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Zhonghao Magnetic Materials Co.,Ltd is one of the leading China ring shape ndfeb magnet manufacturers and suppliers welcome to wholesale ring magnets, neodymium ring magnets, disc magnets, neodymium disc magnets, disc shape ndfeb magnet from our factory. Rare earth permanent magnetic materials is the samarium, neodymium mixed rare earth metals and transition metal (such as alloy of cobalt, iron, etc.), by the powder metallurgy method of pressure sintering, the magnetizing field of a magnetic material Rare earth permanent magnetic materials has become important materials for el