... Plugged with Solder Mask, RoHS Compliance. 12-Layer PCB,Taconic Material,2.0mm Thickness,Immersion Tin,Impedance Controlled,Vias Plugged with ... Gold, Immersion Tin, Immersion Silver, OSP,Gold Finger, Peelable Mask, Carbon PrintingMaterialFR4, ROGERS, Taconic, ARLON, BT, Ceramic, Aluminum 12-Layer PCB ...