Factory Permanent Neodymium NdFeB magnet N35 N38 N40 42 45 52, M H Sh Au Uh Grade Round/Block/Ring/Arc/Disc/Cylinder/Countersunk Magnet with Customized Size - China Corrosion Resistant NdFeB, NdFeB | Made-in-China.com
How strong is a Neodymium Magnet? - SuperMagneticShop