Universally Compatible Underground Fence Wire - Multiple Lengths of Solid Copper Wire in Various Thicknesses for All Models of in-Ground Electric Dog Fence Systems 1,000 Feet of eXtreme Protection 20 Gauge Electric Dog Fence Wire - Polyethylene Coated - Stronger and Longer Lasting than Factory Packaged 20 Gauge Wire Solid Copper Core Protected by a Rugged Polyethylene Jacket to Protect from UV Rays, eXtreme Temperatures, and Water Compatible with All Dog Fence Systems / All Brands (See List Below) / Universal Proudly manufactured in the United States See our Amazon store for more pet fence accessories and related items