1.selectivity immersion gold Plating Pcb 2.UL ,ROHGS,SGS,ISO ... Layer1,2,4 or 6,upto 30layerOrder Quantity1 to 50,000Board ShapeRetangular,round,slots,cutouts,complex,irregularBoard TypeRigid, Flexible ... .01'',0.25mm, or 10milsSurface FinishHASL,Nickle,Immersion Gold,Immersion Tin,Immersion Silver,OSP,etc.Board Thickness Tolerance ... perseverance to stick to it. selectivity immersion gold Plating Pcb