1,OEM offered 2,Good quality and good price. 3,Certificates: UL, ISO,SGS 4,PCB ... . Track width/space4/4mil(0.1/0.1mm)Surface FinishHASL, Lead free HASL, OSP, Gold-plating, Chemical silver, Chemical gold(ENIG ... , in cartonsTerms of paymentT/T ,L/C or Western union high quality single layers lead free HASL pcb for electronic