... CEM-1,CEM-3,FR-4 High TG FR-4,Lead free material(ROHS Compliant),AluminiumLayers1-18Board Thickness0.2mm-4mmThickness Tolerance±10 ... -CUT/Bridge/Stamp HoleSurface TreatmentOSP: 0.5um HASL:2.5um Lead Free HASL: 2.5um Carbon Ink Gold plating: AU 1-5u ...