... layers 5.Accept small quanti Rigid pcba, pcb electronics:·Immersion gold plating PCB·High frequency PCB·High TG (170C) PCB ... Impedance control PCB·Different PCB surface finish: HAL, Flash gold, Immersion gold ·Colorful solder mask PCB·PCB Bwith Bridge Connecting·RoHS1 ... ,Immersion gold,Immersion tin,Immersion Silver,Plated gold,OSP,Carbon ink.12.Solder Mask Color:Green,Red,White,Yellow,Black,Blue.13. ...