1>segment motor magnet 2>segment magnet 3>Grade ... magnet, are composed of neodymium, iron, boron and a few transition metals.These magnets are extremely strong ... -Ni, Nickel, Epoxy,Au, and so on shaped : Ring ,Block, Disc, Arc, segment, cylinder, and special size. etc Attributes of ... for sizeGood in ambient temperatureModerately pricedMaterial is corrosive and should be coated for long term maximum ...