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Customized Super Strong Ring Neodymium Magnet for Speaker. Wide Grade Range: Available in N30H to N50, N35M, N33H, N30SH, N28UH, N28EH, and N30AH grades for diverse needs. Custom Tolerance: Precision manufacturing with +/-0.05mm tolerance for high-accuracy applications. Nickel Coating: Durable Nickel plating provides excellent corrosion resistance and surface finish. OEM/ODM Service: Full OEM and ODM support available with 11 R&D engineers and advanced production lines. Multi-Application: Ideal for electronic products, speakers, industrial magnets, and motor applications. High Performance: Super strong NdFeB magnets with high remanence and coercive force for stable performance.