The mouse bites, additionally known as as perforated breakaway tabs, area unit the sharp edges, what area unit left over once depanelization once the PCBs area unit factory-made in a very panel victimisation break-routing / break-off tabs . Mouse Bites area unit a line of small holes in a very PCB board rather like the holes around postage stamps, allowing tiny PCBs to be utilized in associate array. Mouse bite perforation is normal for FR4 panels. Drilling these holes leaves rough edges of additional remaining material protruding the facet. While, a V-groove PCB with a V-scored edge is swish.