FR-4 PCB board 1.High quality, low cost & fast delivery 2.NO MOQ PCB board 3.Free sample before production 4.RoHs complaints electronic HDI ... ±10%±5%Surface FinishingHASL, Lead free HASL, Immersion gold, Immersion tin, Immersion Silver.Plated gold , OSP, Carbon ink, Insulation Resistance 1012ΩPeel ...