... ,segment size:according to your need Permanent Neodymium Magnet mainly comprised of neodymium ,iron and boron,is the third generation ... high remanence,coercivity,and Max.energy product. Permanent Neodymium Magnet grade:N35,N38,N40,N42,N45,N48,N50,N52 ... average low weight loss less than 2 mg/cm2 Neodymium Magnet applications:loudspeakers,motor assemblies,windmill,Home appliance,acousics,communication ...