European size (160 × 100 mm) Printed circuit boards made from FR2 laminated paper (HP), coated with solder mask FR4 epoxy circuit boards (LF), lead-free, tin-plated Material thickness 1.5 mm 35 μm copper laminate Hole pattern 2.54 × 2.54 mm Continuous conductor tracks with hole O 1 mm Grid for various multiple contact strips depending on the design