... block,segment size:according to your need permanent Alnico Magnet Material: Neodymium(ndfeb) Coating:Nickel shape:block,segment size:according to ... the third generation of the rare-earth permanent magnets,Sintered Ndfeb is the strongest permanent magnets in the world up ... linear motor,mircrophones Pros: Very strong hold when contacting another magnet or plain iron, very difficult to pull away (easy ...