... 0.2mmMax. Board Thickness/Hole Ratio: 12:1Min. Solder Mask Bridge: 4mil (Min. SMT Pad Space 8mil)Min. ... , blue, white, yellow, purple, and matt, etc.Solder mask hardness: 6HLegend/Silk screen Color: white, yellow, black, ... Immersion silver, etc.Other Technology: Gold finger, peelable mask, Non-across blind/buried vias, characteristic impedance control, ... are welcome. PCB with green solder mask factory