Mainstar Industries LimitedWe, Mainstar Industries Limited, are incorporated in Hong Kong and have a manufacturing plant China. We company specialized custom magnetic components including switching power transformers, modem line filters, pulse transformers coupling toroidal chokes, inductors etc. Our plants technically ....Address:Block A, 13/F., Hop Ming Factory Building, 6-10 On Yip Street, Chaiwan, Hong KongProduct/Service:transformer, choke, coil, magnetic component,transformer, choke, coil, magnetic component