The Pestairs Heavy Duty Dog Tie Out Trolley System is equipped with a 75ft dog tie out cable and a 10ft runner cable that are vinyl covered to protect against rain and rust. This durable and long-lasting system provides nearly 1500 square feet of playing area to explore and roam with safety and security. The turnbuckle is easy to adjust the length and tension, while avoiding sagging and helping the pulleys slide smoothly along the cable. The snap at the end of the run cable is designed as a 360tangle free swivel, which offers increased strength and security. The aerial tie out cable can effectively avoid the bushes or other obstacles on the ground, letting your dog run safely and happily without tangling.