... ,N33AH,N35AH(Max.operational temperature:up to 230c) neodymium ring magnetic Outsanding product:1)high performance:N52,N48M,48SH,42UH ... average low weight loss less than 2 mg/cm2 neodymium ring magnetic applications:loudspeakers,motor assemblies,windmill,Home appliance,acousics, ... iron, very difficult to pull away (easy to slide however). Pretty strong hold between two of these even with a couple ...