1.FR-4 green color solder mask single side pcb bare board; ... board. pcb RODUCTION CAPABILITYSolder Mask Types: Green, White, Blue, Red, Matt Green, Matt Black etc.Surface Finishing: Lead ... Gold (ENLG), Immersion Silver, Immersion Tin;Electronic Gold (Plate Gold), OSP, Gold Finger;Lead free HASL+ Gold finger ... Impedance+-/10%double side pcb] FR-4 green color solder mask single side pcb bare board