The double dog leash is made of premium double layered nylon fabric, which makes the dog leash more durable and can hold a 180 pound dog The buckle is steel instead of plastic for avoid breakage Mountaineering rope and braided nylon elastic extension make the dog leash more durable, yet lightweight, durable and easy to clean The 360 untangled buckle design prevents the leash from twisting when walking 2 dogs; The length of the dog can be adjusted by the buckle, allowing your dog to have a wider range of activities The unique bungee jumping design helps absorb the impact of rapid movements when used with energetic companion dogs, reducing the feeling of being pulled The length of the elastic cord can be extended by 20 inches to 35 inches, with strong pulling force, allowing your dog to have enough room to run in front of or next to you If the product is damaged or defective when you receive it, or if you use it If you have any problem with the back belt, please feel free to contact us (email us regarding your problem) We will get back to you as soon as possible