... and price 3)has strong magnetic force Large Ring magnet N35,N38,N40,N42,N45,N48,N50 ... ,N40,N42,N45,N48,N50,gradeProduct specifications:1. Ring NdFeB magnet with different grades of: N35,N38, ... SH,UH,EH) etc.2. Working temperature for Ring shape NdFeB magnets:from 80 centigrades to 200 ... magnet :Neodymium magnets are mainly made from neodymium ,iron, and boron. It is the ideal magnetic material ...