... Solder Mask, HASL Finish, Contour Punched.· FR1 Single Sided PCB with Flash Gold, Peelable Mask, White Legend, Hole & Contour Punched.· ... Yellow Legend, Hole & Contour Punched.· FR4 Single Sided PCB with CNC Drilled Holes, Black Soldermask, White legend, Slot & Contour ... Jumper, Slot & Contour Punched.· FR1 Single Sided PCB with Carbon Jumper, Gold Flash Key Pad, Hole & Contour Punched. COMPUTER PCB