... pcb manufacturer ,our products include blank pcb, single sided pcb,double sided pcb,multilayer pcb,flexible pcb,fr4 pcb,fr2 pcb,fr1 pcb,cem1 pcb,cem3 pcb,aluminum pcb, ... 0.004”(0.2mm ±0.1mm)4-layer:0.01”±0.008”(0.4mm ±0.1mm) ... hole size0.0008” (0.02mm)Aspect ratio20(5:1)Solder MaskColorgreen,light green,white,black,dark brown,yellow ... residual thickness )FR-4(1/3+-0.1mm);FR-1,FR-2,CEM-1,CEM-3(1/2+-0.1mm)V ...