Neodymium Magnet Material: Neodymium(ndfeb) Coating:Nickel shape:block,segment size:according to your need Permanent Neodymium Magnet ... 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). Pretty strong hold between two of these even with ...