... : FR-4 Board thickness : 0.062" Layers : 4 Trace width/space : 8 mil/8 mil HASL(Tin/lead) board· FR1 Single Sided ... Gold, Peelable Mask, White Legend, Hole & Contour Punched. · FR1 Single Sided PCB with Green Soldermask, Yellow Legend, Hole & Contour Punched ... . · FR4 Single Sided PCB with CNC Drilled Holes, Black Soldermask, White legend ...