1, KB(FR-4) ,ROHS UL 94V-0 2, Board thickness:1.6mm, ... , including MLB with blind/buried via holesMain base material:FR-1, FR-2, FR-4, CEM-1, CEM-3, High Frequency Laminate with ... Grandwork, we are looking forward to your inquiry!OUR PARTNERS: FR-4 single side 1 layer pcb