1.FR4,2 layer pcb,1.6mm,1oz ,ENIG 2.High quality 2 layer pcb supplier 3,pcb+pcb assembly+Parts 4.10 years ... .1mmCopper thickness in hole≥25.0um≥25.0umMini. pad diameterInner layer 0.05mmOut layer0.076mm0.076mmMini. Hole Diameter0.25mm0.20mmHole tolerancePTH ... , Immersion gold , Gold plating, Rosin, Gold fingerVIEW OF MOKO FACTORY 2 layer pcb (ENIG finish)