... 4.One-stop-serviceprinted flexible circuitsWe are a Manufacturer & Supplier Specializing in Double Side PCB, Multi-Layer PCB, F4BK PCB, Ceramic PCB, Rogers PCB, Aluminum PCB. ... prototype quantities, and testing.We supply all kinds of flex PCB Specifications: 1) Min. Trace width: 0.004" 2 ... 10oz. And 20oz. (RA and ED copper) 7) Cover-layer: Polyimide and polyester (solder mask printing is available) 8) ...