Shenzhen Hejin Circuit Co.,Ltd is a leading multilayer pcb exporter,Website:http://www.hjmcpcbs.com, and one of the leading China multilayer pcb manufacturers, producers and suppliers. We export high quality products, and we are professional at multilayer pcb assembly and oem.Layer Count:4L Board Thickness:1.6MMCopper Thickness:35UMBase Material:FR4 Surface Finishing:Immersion goldSolder Mask Color:Blue UL approved,RoHS compliant