Finished board thickness: 0.4-2.5mm Min. inner thin core thickness: 4mil Working panel size:Max: 20 X24 Min: 10 X10 Layer to layer registration: +/-2mil Drill hole size: 0.25~6.5mm Min. Finished hole size: 8mil Drilling true position tolerance: +/-2mil Drilling hole tolerance: +/-3mil(PTH); +/-2mil(NPTH) PTH thickness: Min. 1.0mil Plating Aspect Ratio: 7/1 Solder Mask registration: +/-2mil Min. outline tolerance: +/-4mil Min. G/F chamfer angle: 20 Finished board thickness tolerance: +/-4mil Impedance tolerance: +/-8~15%ohm Bow & Twist: