The PCB specifications :
TG170,material:TU-768 (made in Taiwan) 1OZ
Black solder mask
via in pad,filled and plated to flat.
Blind vias :L1-L2,L1-L3,L1-L4,L1-L5,L1-L6,L1-L7
Storm Circuit made a lot of HDI circuit boards. Any layer HDI is the most complex circuit boards that the holes can be from any layer to any layers.We made an any layer HDI PCB for audiophile earphones.
16 layer PCB
Different Thickness PCB
6 Layer PCB Assembly
Via in Pad