... N45 SGS,ROHS,ISO9001 China Magnets mainly comprised of neodymium ,iron and boron,is the third generation of the rare-earth permanent ... acousics,communication equipment,toy,car,servomotor,step motor,DC motor and linear motor,mircrophones Pros: Very strong hold when contacting ... another magnet or plain iron, very difficult to pull away (easy to slide however). ...