The multilayer pcb circuit board description: 14 layers printed circuit board Blind/burried via hole pcb board with laser drilling Material: fr4, high tg pcb board(tg 170) Finished thickness: 1.6 mm Finished copper: 1 o/z (outside), 0.5 - 1 o/z (inside) Min hole size: 0.1mm, laser drilling Min line & width: 3/3 mil