1.large magnet, big magnet 2.dimension as to client's requirment ... time (3 days if urgent) 4.Resonable price Neodymium magnet, large magnet, big magnet ( dimension as to client's requirment); also ... resonance sound device magnetic suspension, DC motors, linear motors, loud speakers, MRI, medical apparatus, transmission machine,etc.Material CharacteristicsPropertyResidual InductionMagnetic Induction ...