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Hongyu Original Factory Supply N52 Cylinder Permanent Neodymium Magnet for Speakers. High Performance Grade: N52 grade offers 100% stronger magnetic force than standard magnets for superior performance. Customizable Shapes: Available in disc, cylinder, block, ring, arc, and other irregular shapes with customized options. Customizable Coatings: Options include nickel, zinc, epoxy, galvanized, and gold plating tailored to working conditions. Comprehensive Certifications: ISO 9001, 45001, 14001 certified and compliant with RoHS and REACH standards. Fast Sampling Service: Precise sampling with performance data provided within 7 working days.