billboard PCB : 1:FR4,1oz, 2L, 2:board thicknesses 1.6mm, 3: ... .30mm, 4:Min. line width /space:0.2mm/0.2mm billboard PCB :Led display,Board size:90*80mm,2 layer,1oz copper ... to 28 layersMaterial type: FR-4, CEM-1, CEM-3, High TG, FR4 Halogen Free, RogersBoard thickness: 0.21mm to 7 ...