... material:FR1 min hole:0.4mm min line width:4mil COMPUTER PCB· FR1 Single Sided PCB with Peelable Mask, V-Score ... Punched.· FR1 Single Sided PCB with Carbon Jumper and Carbon Key Pad, White Legend, Hole and Contour Punched.· CEM1 Single Sided ... Punched.· FR1 Single Sided PCB with Carbon Jumper, Gold Flash Key Pad, Hole & Contour Punched.