... .FR4 material 3.Immersion gold 4.2-Layer pcb board 5.Low price+high quality+fast delivery PCB Process Capability ... width / spacing :3-4 mil (0.076-0.10mm)Maximum board size: Single & Double 22 "x 43" (550 x1100mm), Multi-layer ... : FR4 ( ShengYi, KB, International), high TG (TG150, TG170), halogen-free board (Halogen-free), high frequency plate (Rogers, Teflon, Taconic), made PTFE (PTFE) ,, AL ...