PROTOPCB is capable of almost any PCB fabrication. Check our capabilities. Up to 64 layers, RIGID, FLEX, RIGID FLEX, board thickness 10 mm,  min line width/space 1.5/1.5 mil, min hole 0.2 mm, laser hole 3 mil, 4+N+4 HDI, POFV, via filling with copper, high-speed and high-frequency,abundant materials, impedance tolerance 5-10%, most popular surface treatments.