... Max.operational temperature:up to 230c) neodymium Rare Earth Permanent Magnet Outsanding product:1)high performance:N52,N48M ... Rare Earth Permanent Magnet applications:loudspeakers,motor assemblies,windmill,Home appliance,acousics,communication equipment,toy,car,servomotor,step motor,DC motor and linear motor ... not the same thing.Other Thoughts: Good for attaching thick stacks of paper to refrigerators ...