... good quality and price 3)has strong magnetic force Large Ring magnet N35,N38,N40,N42,N45,N48,N50,N52( ... ,N38,N40,N42,N45,N48,N50,gradeProduct specifications:1. Ring NdFeB magnet with different grades of: N35,N38,N40 ... H,SH,UH,EH) etc.2. Working temperature for Ring shape NdFeB magnets:from 80 centigrades to 200 centigrades. ... are always available here, welcome your inquiry, thanks. N50 large ring magnet