... , Blue Solder Mask, Vias Plugged with Solder Mask, RoHS Compliance. 2-Layer PCB,Gold Finger,Blue Solder Mask,Vias Plugged with ... (0.05mm) NPTH hole dia tolerance+/- 1mil (0.025mm) Hole Position Deviation+/- 2mil (0.05mm) Outline Tolerance +/- 4mil (0.1mm)S ... , Peelable Mask, Carbon PrintingMaterialFR4, ROGERS, Taconic, ARLON, BT, Ceramic, Aluminum 2-Layer PCB with Gold Finger