... 30UH-40UH, 28EH-38EH, 28AH-35AH4. Shape: Disc(Cylinder), Block, Ring, Countersunk, Segment and more, trapezoid, irregular shape, ... Outer diameter 220mm6. Coating:Ni, Zn, NiCuNi, gold, copper, epoxy, chemical, parylene, Everlube, passivation ,tin and CR3 + Zn7. ... Available Attributes of Neodymium Magnets: d)Very high resistance to demagnetization High energy for size Good in ambient temperature ...