Extreme Dog Fence High Performance Boundary Wire - Reliably Compatible with All Brands and All Models of Professionally Installed and D.I.Y. Pet Containment Systems 20 Gauge Wire - Twice as Thick a Protective Jacket as Factory Packaged 20 Gauge Wire (Included with Average DIY Fence Systems), for Stronger Protection Around the Solid Copper Core 500 Foot Continuous Spool (for Coverage Up to 1/2 Acre) - Eliminates the Need for Splicing Wires Together HMW Polyethylene Coating - Superior Protection Against UV Rays and Water Exposure Universally Compatible With All Wired Electric Dog Fence Systems - All Brands and Wired Applications eXtreme Dog Fence Wire Products Are PROUDLY Manufactured in the United States with True American Craftsmanship