1.FR-4 green color solder mask single side pcb bare board; 2.Meet ROHS, UL, ISO9001:2008, SGS test. 3.Rigid PCB bare board. pcb RODUCTION CAPABILITYSolder Mask Types: Green, White, Blue, Red, Matt Green, Matt Black etc.Surface Finishing: Lead Free Hot Air Leveling (HASL), HAL;Immersion Gold (ENLG), Immersion Silver, Immersion Tin;Electronic Gold (Plate Gold), OSP, Gold Finger;Lead free HASL+ Gold ...