pcb board wireless: 1, KB base material 2,flash gold, 35um,2 ... single/double sided board, multi-layer board, high density board, including MLB with blind/buried via holesMain base material:FR-1 ... constant (imported or from local supplier), Aluminum base laminate, Metal core AluminumSurface Finish:Hot air Lev ... Inner core thickness 0.15-1.5mm, finished board thickness 0.20-3mmCopper Foil Thickness:1/3 ...