... , Impedance Controlled, Vias Plugged with Solder Mask, RoHS Compliance. 12-Layer PCB,Taconic Material,2.0mm Thickness,Immersion Tin,Impedance Controlled ... Thickness2 layers - 8mil (0.2mm)4 layers - 16mil (0.4mm)6 layers - 24mil (0.6mm)8 layers - 32mil (0.8mm)10 ... Mask, Carbon PrintingMaterialFR4, ROGERS, Taconic, ARLON, BT, Ceramic, Aluminum 12-Layer PCB with Taconic Material