Our high level and powerful neodymium speaker magnets meet hundreds of speaker requirements. Besides producing ferrite speaker magnets, we are providing powerful Neodymium speaker magnets with the shape of ring, disc, block, cylinder, block and segment. NdFeB speaker magnet features: 1. Sizes: Φ3 up to 220mm 2. Grade: up to N52 maximum 3. Coated with CR3/ZN (environmental protection Zn) mainly used in MP3, MP4, mobile, speaker, consumption electronic applications and more 4. Maximum working temperature: 250 degree Celsius Material grade of NdFeB magnet: 1. Magnet N-(N35, N38, N40, N42, N45, N48, N50, N52) 2. Magnet M-(35M, 38M, 40M, 42M, 45M, 48M) 3. Magnet H-(35H, 38H, 40H, 42H, 45H) 4. Magnet SH-(30SH, 33SH, 35SH, 38SH, 40SH, 42SH) 5. Magnet UH-(28UH, 30UH, 33UH, 35UH, 38UH) 6. Magnet EH-(28EH, 30EH, 30EH, 33EH, 35EH) For more detail info, please feel free to inquire us at any of your convenience.