... factory 2.No middleman/No trading company 3.Good price Reference Rigid 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 ... frequency PCB ,etcPackingInner :Vacuum packing/Plastic bagOuter :Standard carton packing 1 layer pcb with immersion gold