... and wonderful coercive force.1. Primary Material: Neodymium, iron, boron, rare-earth material2. Maximum working temperature: 80-220 degree celcius3. Density: 7 ... to 7.6g/CMM³4. Application: Motors, Windmill, Acoustics, Magnetic separators, Auto, VCM, MRI, Mobile accessories5. Grade available:N35-N52, N33M ...