... . double side white material PCB board2. solder mask: transparent color3. Fast delivery and competitive price4. Certificate: ROHS, ... HASL,HASL lead-free,HAL, Flash gold, immersion gold, OSP, Gold Finger Plating, Selective thick gold plating, immersion silver, immersion tin ... blind vias, impedance control, thick Cu PCB, selectivity plating gold 30 microinch19). Profiling: Punching, Routing, V-CUT, ...