MonsterDog&reg; Heavy Duty Underground Electric Dog Fence Wire 16 gauge Solid 1000 Feet 45 mil Polyethylene Jacket Professional Grade Works with all dog fence brands,PetSafe,SportDOG,Invisible,Pet Stop,DogWatch,Dog Guard,Innotek and others 45 mil Extra Heavy Triple Duty Polyethylene Jacket Sunlight Resistant and Direct Burial Rated. Always look for the Jacket Thickness when comparing brands. Solid Copper Core, NO Cheap Steel or Aluminum Clad that's harder to work with and can corrode. Fast and Free Shipping and 2 free DBY Splice Connectors with each reel. USA Made MonsterDog Dog Fence Wire Since 2005