4-layer PCB with 70UM Copper thickness 1.CE,ROHS,ISO9001 approval 2.small order is ok, 4-layer PCBMin. line space: 0.15mmMin. line width: 0.15mmMin. hole diameter: 0.10mmThickness: 1.6mmType: PTH (SMT, DIP)Base laminate materials: halogen freeSurface finish process: HASL ,OSP,Immersion Au &Ag,Sn,Plating Au etc 4-layer PCB with 70UM thickness board for electronic product