Number of layers: 6

Plate: fr4 sf202

Surface treatment: Shen Jin sink

Sheet thickness: 1mm (hard plate thickness 0.8mm, soft plate thickness 0.2mm)

Minimum hole: 0.1mm

Line width line distance: 2.9 / 2.9mil

Process: just flexible 1st-order HDI, the internal and outer layer copper thickness 12UM, 1-2 / 5-6 / 2-6 blind holes, step holes, control deep, impedance