Specially engineered for electronic dog fences with electrical and mechanical properties optimized for your dog containment application. Everything you need to extend your electronic fence boundary an extra 500-ft. Suitable for use with any brand electronic fence. Solid core copper alloy. Extra thick, high-strength insulation. Highly resistant to sunlight, moisture and ground rot. For use as buried wire or for above ground installation with optional yard staples (model YS-50 kit, sold separately). Complete kit includes 500-ft ultra-wire, 50 flags and 5 burial-grade wire splices. High Tech Pet Electric Fence Wire and Flag Kit in Black | BE-500