The Boss Pet Aerial Dog Run Tie Out Trolley System with leash includes everything needed to create an aerial dog run to allow dogs the freedom to roam between two specific points. Premium quality vinyl coated galvanized steel aircraft cable. Patented, premium quality swivel snaps help reduce tangling. Patented DIrect-Connect system connects swivel snaps directly to cabling for a strong and secure connection. All high quality materials, in three lengths for dogs up to 60lbs. Easy to install.