... silk screen:yellow rigid pcb1.semi-ring board with 2layers2.surfaced by immersion gold3.Transportation by air,by ... reference: DescriptionDetails SpecificationBase MaterialFR-4,Aluminium-backed board,Halogen-free,Lead-free compatible,High Tg,High ... typeHigh precision multi-layer board,Blind hole board, Buyerd hole board,High frequency board,Aluminium backed boardCertificateISO9001.UL etcWelcome ...