PETSAFE WIRE: Unleash the potential of your pet's play area with the PetSafe Boundary Wire. This electric fence wire offers a 500-foot spool of solid core, 20-gauge copper wire that covers approximately 1/3 of an acre, giving your pet plenty of room to explore and enjoy. DURABLE INSTALLATION: Crafted for most in-ground fence installations, this invisible fence wire is a solid core 20-gauge copper wire designed for direct burial. This in-ground fence wire guarantees durability and longevity, even under various weather conditions and soil types. WATERPROOF ACCESSORIES: For best results with your dog fences, consider using Gel-filled Splice Capsules and wire connectors (RFA-366), sold separately. These accessories provide a waterproof connection, vital for preserving the invisible fence wire's functionality and longevity. TRUSTED BRAND: Place your trust in the quality assurance of the PetSafe brand, a worldwide leader in pet behavior, containment, and lifestyle innovations since 1998, and their invisible dog fence wire. This dog fence wire, backed by the brand's long-standing reputation, ensures your pet's safety and contentment. FENCE EXTENSION: Extend your In-Ground Fence boundary effortlessly with this Extra In-Ground Boundary Wire. This wire, a flexible and convenient solution for expanding your dog fences, is spooled at 500 ft. / 150 meters, providing sufficient length for most fence installations.