8 layers high speed photovoltaic PCB

Board thickness：1.6mm  

Material: FR4-TG170
Min. Line Width/ Spacing：4mil/4mil  
Spacing between holes to traces：7mil
Min. Hole Size: 0.2mm  

Aspect Ratio: 8:1 
●　Impedance control　●　Resin plug hole　●　Gold Finger