... shape:dics,ring,block,tile size:accord to your need Strong Magnetic Separator mainly comprised of neodymium ,iron and boron,is ... excellent properties of high remanence,coercivity,and Max.energy product. Strong Magnetic Separatorgrade:N35,N38,N40,N42,N45,N48,N50,N52 ... ,step motor,DC motor and linear motor,mircrophones Pros: Very strong hold when contacting another magnet or plain iron, very difficult ...