Masbrill Boundary 20 Gauge 500ft In Ground Expand Pet Fence Wire Blue 150 Meters MASBRILL Boundary Wire 20-Gauge Copper Wire 500 Ft for Dog and Cat In-Ground Pet Fence, Expand Your Pet Fence Coverage, 500 Ft Expand your In-Ground Fence Boundary. Each spool of Extra In-Ground Boundary Wire comes with 500 ft. / 150 meters of 20 gauge, solid core, copper wire rated for direct burial. This covers up to 1/3 acre per spool. The length of wire needed will vary due to amount of twisted wire and the layout you select. A waterproof connection is needed for proper performance when adding additional boundary wire. Expand Your Existing In-Ground Fence - 500 feet covers approximately 1/3 of an acre, create a custom boundary for your pet or expand your existing in-ground fence. Perfect for Most In-Ground Fence Installations - Solid core 20 gauge copper wire is rated for direct burial.