... (ENLG), Immersion Silver, Immersion Tin;Electronic Gold (Plate Gold), OSP, Gold Finger;Lead free HASL+ Gold finger, HAL/HASL ... Ink, Peelable Blue Gum; Immersion Gold+ OSP. ItemSpecificationsNumber of Layer1-12LayersMaterialFR-4, AL PCB, CEM-1, Taconic, RogersFinish Board Thickness0.2mm- ... ,double-sided ,multi-layer,high frequency,MCPCB,metal-backed PCB,welcome your enquiry. FR-4 single side 1 layer ...