1, controller board with red oil 2, experienced design and copy service ... board assembly1Layer1-30 layer2MaterialFR-4,CEM-1,CEM-3,Hight TG,FR4 Halogen Free,FR-1,FR-23Board thickness0.2mm-7mm4Max.finished ... .0514CertificateUL,ISO9001,ISO14001,ROHS,CQC,SGS15profiling punchingRouting,V-CUT,Beveling 1 oz copper thickness professional 4 layer pcb supplier