DUAL SHOCK ABSORPTION TROLLEY SYSTEM: The top end of the leash is equipped with a shock absorbing spring, while the leash itself is designed as a cushioned spring cable that stretches from 2ft to 15ft in length.This not only provides better shock absorption and protection for your dog, but also increases their range of motion ANTI-TRANGLING DESIGN: The cushion spring cable design prevents the rope from dragging on the ground and reduces the risk of your dog tripping compared to ordinary straight ropes on the market. The 360° swivel hooks on both ends of the rope also help prevent tangling HEAVY DUTY SECURITY SWIVEL LOCKING BUCKLE: High-strength zinc alloy locking buckle is rust-resistant and long-lasting, and the 360° swivel locking hook design allows your dog to move freely in the yard, park, or camping while ensuring safety and preventing escape UPGRADED DAMAGE-PROOF MATERIAL: Our outdoor dog runner cable is made of 5mm bite-resistant stainless steel wire, double crimped to make the ends stronger and double-coated with rust-resistant vinyl. Thicker and longer screw hooks ensure secure screwing to a tree or wall for large dogs up to 250 lbs QUICK INSTALLATION, CONVENIENT TO CARRY: Upgraded L-wrench for fast screwing into trees, walls or house frames. The included storage bag is easy to carry, camping, hiking or other outdoor activities ASIN B0DYKCDVXB Size 30ft+16ft Color Silver Pattern Solid Brand Name VST Closure Type Buckle Manufacturer VST Material Type Vinyl Dog Breed Size Large, Medium, Small