... Service 4.Low price high quality PCB printed circuit board, PCB, Multilayer pcb.Our PCB Technical Specifications ... .Board finishing type: Hot air leveling, soft gold, hard gold, immersion gold, gold fingers.Major Products and Services:printed circuit board ... TreatmentHASL (Tin-Lead Free), ENIG(Immersion Gold), Immersion Silver , Gold Plating (Flash Gold), OSP, etc.14SoldermaskGreen, White, Red, ...