... , PCB fabrication, PCB assembly, and engineering support. Yingstar PCB Technical Capabilities:layer1-36 layerMax Board Size1100*599mm 43.3" * 24"Min Board Thickness4 layer ... , 1.0 oz, 1.5oz, 2.0oz,3.0 oz,4.0 ozSurface finishHASL,Nickle, Imm Gold,Imm Tin,Imm Silver ... , OSP etc.Board materialFR-4 glass epoxy, FR4 High Tg, RoHS compliant; Aluminum, Rogers, etc ...