... high performance rare earth permanent magnets, which use neodymium (Nd), iron (Fe), and boron (B) as their main ingredients ... 30UH-40UH, 28EH-38EH, 28AH-35AH4. Shape: Disc(Cylinder), Block, Ring, Countersunk, Segment and more, trapezoid, irregular shape, ... , Nickel+Copper+Nickel, b)Temporary Surface: Passivation c)Dimension are Available Attributes of Neodymium Magnets: d)Very high resistance ...