... shape:block,segment size:according to your need Permanent Magnetic mainly comprised of neodymium ,iron and boron,is ... of high remanence,coercivity,and Max.energy product. Permanent Magnetic grade:N35,N38,N40,N42,N45,N48,N50 ... Permanent Magnetic applications:loudspeakers,motor assemblies,windmill,Home appliance,acousics,communication equipment,toy,car,servomotor,step motor,DC motor and linear motor, ...