DESIGN FOR TWO DOGS: Our Patented Two Dogs Trolley System features 4x Spers,can create a safe distance from the anchor points,effectively prevent two dogs from wrapping itself around the obstacle (tree or post,etc) or each other,Easy to adjust the posit of the sper with only hands,no tools required. Ideal for cping,outdoor events,travel and more. HEAVY DUTY DOG RUNNER SYSTEM for two dogs up to 250 lbs: Equipped with a 100ft dog trolley tie out,2x 10ft runner cable and a 10 ft side cable,which are vinyl covered to protect from rain and rust,durable and long-lasting enough to stand up constant activity,provide nearly 2000 square feet of playing area to explore and ro with safety and security. Turnbule is easy to adjust the length and tens,while avoiding sagging and helping pulley slide smoothly ng the cable. INSTALLT WITHOUT HURTING THE TREE: we provided a separate sturdy 10ft side cable,you can easily install this trolley tie out cable between two trees without drilling holes in the tree with screw hooks. Plus,we also provide two welded eye screw hooks for you to install it between de postswall or fre of house. SHO-ABSORBING DOG RUN CABLE: Features a sturdy sho-absorbing spring,designed as a elastic buffer to protect ast sudden ss and jerks,help your dog the tens more directly to avoid injury. Also includes a strong screw loing clasp,which slides smoothly across the aerial tie out cable without tting stu and loose,following your dog as he sniffs and explores. NO & SAFE DESIGN: Our patented dog zip line features 4 spers,which will create a safe distance to prevent the dogs from tting d in trees or each other. The snap at the end of run cable is designed as a 360° swivel,which offers increased strength and security,strong enough to withstand the most intense pulling. The Aerial tie out cable can effectively avoid the bushes or other obstacles on the ground,let your dog run safely and happily without . EASILY INSTALL BY ONE PERSON: The video installat instructs are included,all parts can be installed quily by one person,Only need a se place to setup the trolley system - existing trees de postswall or fre of house (just be mindful of loose or rotting wood). WHAT’S INCLUDED IN THE PAA? Contains a 100 ft aerial trolley cable,2x 10ft dog run cable,a 10ft side cable,4 spers,3 clps,2 screw loing clasps,an installat instructs. FOR ANIMAL LOVERS & WORRY : Our Patented Two Dogs Heavy Duty Dog Trolley System is designed and tested with durability for outdoor use in rainsunsnow and wind,great for outdooryard or cping. We our product,so if for any reason you're not pletely satisfied with it,we'll refund every y (or replace it at no cost if there's a problem). "Add to Cart" Now!!!.