Continous 1000 ft spool (Not 2 500 foot spools) Solid Core Heavy Duty Professional Dog Fence Wire;Compatible with all brands, including Dogwatchﾃつｮ, PetSafeﾃつｮ, Invisible Fenceﾃつｮ Brand, Innotek, Sportdog;45 mil polyethylene (plastic coated) solid core wire;Sunlight resistant, Direct Ground Burial Rated Underground Perimeter Wire;Made in the USA eXtreme Dog Fenceﾃつｮ brand