1,OEM offered 2,Good quality and good price. 3,Certificates: UL, ISO,SGS 4,PCB ... , Gold-plating, Chemical silver, Chemical gold(ENIG), Chemical tin, Carbon ink.Solder Mask ColorGreen, yellow, black, white, red, blueProfilingPunching, Routing, V ... , in cartonsTerms of paymentT/T ,L/C or Western union high quality single layers lead free HASL pcb for electronic