1)size:D110-30*20mm 2)in good quality and price 3)has strong magnetic force Large Ring magnet ... H,SH,UH,EH Largest size:OD170mm Ring shape with hole High coercive forceNeodymium Ring Magnet with N35,N38,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 ...