... material:FR1 min hole:0.4mm min line width:4mil COMPUTER PCB· FR1 Single Sided PCB with Peelable Mask, V-Score ... legend, Slot & Contour Punched.· FR1 Single Sided PCB with Carbon Jumper and Carbon Key Pad, White Legend, Hole and Contour Punched ... Drilled Holes, Silver Jumper, Slot & Contour Punched.· FR1 Single Sided PCB with Carbon Jumper, Gold Flash Key Pad, Hole & Contour Punched. COMPUTER PCB