... -(N28AH, N30AH, N33AH), working temperature:220 degree Celsius.2.3.Magnet shape: Block,Ring, Arc,Disc, Cylinder, Rod,Bar, Cube,Sphere,Strip ... in ambient temperature. High anti-corrosion and stable performance.7. Technology: Application of new sintered NdFeB magnet techniques and equipment like casting ... the most that we can do for you. NdFeB strong block magnet