W Magnet InformationProducts:Magnetic Ball Material:Neodymium-Iron-BoronCoating:Ni-Cu-Ni ,Nickel ,Zn ,Gold ,Cr ,Silver ,Copper ,Black ,Epoxy ,Chemical ,PTFE , ParyleneShapes:Disc, Cylinder, Block, Ring, Countersunk, Segment, Trapezoid, Irregular shapes and customized made.Applications:Used in many fields, such as motors, sensors, microphones,..