The smaller the gauge number, the larger the wire. The larger the wire, the stronger and more dense the energy field. The stronger fields may provide quicker results but may be too intense in some situations. Sometimes a lighter gauge wire is needed to provide a more gentle therapy. To get an idea of the wire size, 4 is extra heavy, 6 is heavy, 10 is medium, and 16 is light. This is the size of a single wire, not the twisted pair.