1~16Layer Material CEM-3,FR-4, High TG, Halogenfree, Rogers, BT(Bismalemide Triazine) Free Finish Board Thicknes 0.2mm~3.20mm(8mil~126mil) Copper Thickness 1/2 OZ min 3 OZ max Min. Trace Width & line Spacing 0.075mm¡ê¡§3mil¡ê© Flash gold Min. Hole Diameter CNC Drilling 0.33mm(12mil) 0.25mm(10mil).