... good quality and price 3)has strong magnetic force Large Ring magnet N35,N38,N40,N42,N45,N48,N50,N52(M ... N35,N38,N40,N42,N45,N48,N50,gradeProduct specifications:1. Ring NdFeB magnet with different grades of: N35,N38,N40,N42 ... . Working temperature for Ring shape NdFeB magnets:from 80 centigrades to 200 centigrades.3. Can be magnetized through thickness,Radial,Multipoles...4 ...