Place of Origin Jiangsu, China (Mainland) Number of Layers 10-Layer Base Material FR-4 or customer requirement Copper Thickness 0.5 ~ 5.0 OZ Board Thickness 0.3 ~ 4.0 mil Min. Hole Size 0.2 mm Min. Line Width 4 mil Min. Line Spacing 3.5 mil Surface Finishing Immersion tin and silver,gold finger,osp