black solder mask PCB 1.high quality, low cost&fast delivery ... all lines of PCB, PCB boards, PCB circuit, circuit board,electronic pcb, Copy PCB, design PCB, prototype PCB, PCB fabrication, PCB layout, we are professional PCB factory.1. Layers ... 0.075mm/3mil7. Copper Thickness: 0.5oz-5oz(17µm-175µm)8. Surface Finishing: HASL, Lead free HASL, ENIG ... .1mmcertificateUL, ISO, RoHS black solder mask PCB