... PCBLayer:1-12Board finished thickness:0.21mm-7.0mmMaterial:FR-4,CEM-1,CEM-3,High TG,FR4 Halogen Free ,Rogers ... ,HF,NELCON,TACONIC,ARLON,etcMax. finished board size:23*25mil(580mm*900mm)Min.drilled hole size:3mil ... PCB ,etcPackingInner :Vacuum packing/Plastic bagOuter :Standard carton packing single layer printed circuit board