... Solder Mask, RoHS Compliance. 2-Layer PCB,Gold Finger,Blue Solder Mask,Vias Plugged with Solder Mask,RoHS ... )Aspect Ratio12:1Finished Copper Weight10 ozImpedance Control+/- 5% Insulation Resistance1E+12Ω(Normal) Thermal Shock 3x10Sec@288 Centigrade DegreeWarp ... ENIG, Flash Gold, Immersion Tin, Immersion Silver, OSP,Gold Finger, Peelable Mask, Carbon PrintingMaterialFR4, ROGERS, Taconic, ARLON, BT, ...