... Nickel, Epoxy, Gold, Silver, Passivation, any coating as you like.3.Magnet shape: Block,Ring, Arc,Disc, Cylinder, Rod,Bar, ... areas,such as:all kinds of electromotors, separators, audio systems, wind turbine, sensors,medical equipment,toys,computers, elevators, cellphones, VCDs and ... N28EH-N38EH;N28AH, N30AH, N33AH sizes 35*45*55mm for small size; large size is available too. shape square magnets; ...