The Boundary Kit BD-18K includes 500 feet of 18 gauge boundary wire, 2 waterproof wire splices, and 50 perimeter training flags to help your dog learn the boundaries. Used with any In-ground Pet Fencing System.  The 18 gauge wire is recommended for soils very rocky or heavy with gravel.  For average soil types see the
Boundary Kit BD-20K which contains 20 gauge wire.

Note:  Most all In-Ground Containment Systems come standard with 20 gauge wire.