... , Impedance Controlled, Vias Plugged with Solder Mask, RoHS Compliance. 12-Layer PCB,Taconic Material,2.0mm Thickness,Immersion Tin,Impedance Controlled ... )4 layers - 16mil (0.4mm)6 layers - 24mil (0.6mm)8 layers - 32mil (0.8mm)10 layers - 40mil (1.0mm)Max ... Mask, Carbon PrintingMaterialFR4, ROGERS, Taconic, ARLON, BT, Ceramic, Aluminum 12-Layer PCB with Taconic Material