A flexible printed circuit board which prevents a short circuit due to a crack in a bending portion is provided. An initial vector map providing a two dimensional representation of vector data, including one or more vector elements, can be texture mapped so that it appears to be located on a surface of the three-dimensional polygon mesh. A rolling bearing is secured to the shaft. The second connection section includes a recess on a top side forming a weakened line across the second connection section for bending the second connection section at the weakened line from the substantially straight shape to a bent shape forming a modified electrical connector having a second different predetermined product safety certification. The inclined surface has long strand oriented such that balls struck up the inclined surface are caught and returned to the student; The striking area which includes an enclosure protecting students in the vicinity of the striking area.