Layers: 4

Finished: immersion gold (1U") + selective hard gold (32U")

Minimum hole size: 0.35mm

Line trace/space: 8/6.9 mils

All of specifications followed IPC class III
Used in medical industry

FR-4 single-sided PCB=60usd/sqm
 FR-4 double-sided PCB=75usd/sqm
 Aluminum PCB=85usd/sqm