6L, BGA-Multilayer PCB 6 Layer PCB Board, BGA PCB, Multilayer PCB, Special Technology PCB, Metal Core PCB, High-Level HDI Hole Technology, Blind Buried Hole PCB, Impedance Control PCB Supplier Layer/Board thickness: 6L/1.6mm Suface Finish: ENIG Trace/Space: 5/6mil Smallest Hole Diameter: 0.2MM PCBMAIN provides special technology PCB with high-level HDI hole technology such as metal core PCB, blind buried hole PCB, impedance control PCB, BGA PCB and multilayer PCB such as 6 layer PCB board, 4 layer PCB board, , 8 layer PCB board, 10 layer PCB board, 12 layer PCB board.