... years of experience in PCB industry 4.UL,SGS,ISO9001,RoHS,QS9000 and TS16949 Layer:1~22 layersMaterials: FR-4, CEM-3, Teflon, Aluminum ... .25 / 0.25mm5Registration Solder Mask ±0.003"±0.075mm Layer to Layer ±0.0024"±0.060mm Copper Feature to Holes(Outer) ±0 ... the above description is to demonstrate the ability of our PCB factory, if you have specific requirements, please feel free to ...