Shenzhen Hejin Circuit Co., Ltd. is a leading metal core PCB manufacturer and exporter in China for over 7 years,Website:http://www.hjmcpcbs.com, specialized in high thermal conductivity aluminum pcb(double and multi-layer), copper pcb (thermoelectric separation), copper-aluminum pcb, iron pcb, COB mirror pcb, rigid-flex pcb and double & multilayer FR4 PCBs with SMT assembly.