... rare earth NdFeb magnets Grade:N30-N40,N42,H,SH,UH,EH, Coating:Zn,Ni,Gold,silver, Application:medicine,machines. N35 sintered rare earth block NdFeb ... 30KOe. 5. very brittle and hard, but lighter than other rare earth magnetic material.6. higher resistance to demagnetion than other magnets ... , speakers and magnetic holding and seperation systems etc. Strong sintered rare earth NdFeb magnets(block)