... production, one stop from pcba design to finished product manufacturers, Rigao Electronics is a professional high precision ... , welcome to buy our products at low price.Product Description1.Detailed Specification of PCB Manufacturing 1Layer1-30 layer2MaterialFR ... Immersion gold, Immersion Sliver, Immersion tine,OSP(Entek),S/G plating,Enepig, G/F Plating, carbon9Copper thickness0.5-4.0oz10Solder mask ...