... quick-turn prototype and mass production for 1-30 layer boards double sided rigid PCB Aluminum FR-4 LED PCB boardelectronic circui board 4 layer ... 21mm-7.0mm3)Material:FR-4,CEM-1,CEM-3,High TG,FR4 Halogen Free ,Rogers,HF,NELCON,TACONIC,ARLON, ... Plating tin,5)Product range:Flex-PCB,Rigid-PCB,Flex-rigid PCB,HDI PCB ,PCB of single,Double and Multi-layers,High frequency PCB ,etc6)Max. finished board size ...