Layer : 4 LayersBase Material : FR4Copper Thickness : 1OZ Outer layer / 0.5OZ Inner LayerBoard Thickness : 1.60mmMin. Hole Size : 8 mil (0.2mm)Min. h : 4 / 4 mil (0.1mm/0.1mm)Min. ing : 4 / 4 mil (0.1mm/0.1mm)Surface Finishing : Immersion goldSolder Mask Color : GreenSilkscreen color : WhiteOututing, V-Groove