... Mask, ENIG, Impedance Controlled, Vias Plugged with Solder Mask, RoHS Compliance. 6-Layer PCB,Gold Finger,Black Solder Mask,ENIG,Impedance ... Controlled,Vias Plugged with Solder Mask,RoHS Compliance. CertificatesULISO9001TS16949ISO14001--------------------------------------------------------------------------------Testing Items100% Electrical Test 100% Visual Inspection ( ...