Layers : Sample 1~32 / Mass Production 1~20 Size :Max shipping size is 600mmx550mm , +/-0.15mm Finished Board Thickness: Min 0.4mm(4L)/0.6mm(6L),+/-0.1mm (Max) 3.6mm(2.2~3.6mm depends on material), +/-10% Copper Thickness :1/3~5oz (Depends on material) Impedance Control :+/-10% Via Holes (Min) : Mechanical Drill:0.2mm / Micro Via:0.1mm PTH+/-0.075mm NPTH +/-0.05mm Aspect Ratio : Sample :10:1 / Mass Production :8:1 Min Trace(Width/Spacing) : Internal 0.075mm / External 0.075mm The tolerance followed by IPC-6012 Advance Process : Blind Routing Cavity,Coil Board,Plug Hole With Epoxy,Half Hole Plated Spacing between Pads : Min :8 mil