... good quality and price 3)has strong magnetic force Large Ring magnet N35,N38,N40,N42,N45,N48,N50,N52(M,H ... ,SH,UH,EH Largest size:OD170mm Ring shape with hole High coercive forceNeodymium Ring Magnet with N35,N38,N40,N42,N45,N48 ... appliances,microphone parts,transmission equipments...Features of NdFeB magnet :Neodymium magnets are mainly made from neodymium ,iron, and boron. It is the ideal ...