... -Layer PCB,Gold Finger,Blue Solder Mask,Vias Plugged with Solder Mask,RoHS Compliance. CertificatesULISO9001TS16949ISO14001--------------------------------------------------------------------------------Testing Items100% Electrical Test 100 ... -0Surface FinishingHASL, LF-HASL, ENIG, Flash Gold, Immersion Tin, Immersion Silver, OSP,Gold Finger, Peelable Mask, Carbon PrintingMaterialFR4, ROGERS, ...