Product Material: Nylon Cloth + Iron Bell Size: Length 96cm, Bell Diameter 3.8cm, Whistle 8*0.7cm Color: Black Package Contents: 1 * Bell Rope, 1 * whistle, 1 * clicker MADE TRAINING EASY- Dog training bells are one of the simple and non-confrontational solutions to make your pup use the toilet. Using dog bells has proven to be an easier, more fun, and win-win way for your dog to communicate instead of barking, scratching, or resorting to a more intrusive method. 2. THREE LENGTH ADJUSTABLE- We have upgraded this dog doorbell to 3 lengths according to customer feedback, the older version only has 2 lengths, the shortest length is still too long for handles that are lower. 3 snaps/buttons allow a longer range of length adjustment so now you can turn it shorter. 3. PREMIUM QUALITY- The potty training doorbell is made of durable nylon material, preventing tripping and withstanding strong tugs. 7pcs 1.4 large extra loud stainless steel bells, shiny and tinkling, perfect hanging doorbells for your pups potty training. 4. STRONG AND DURABLE - These dog bells and belts are custom made and thoroughly tested for durability. The belts are excellent stitched, durable and chew resistant.Bells use plating technology to keep the shine and not rust.The connection of the bells and snap points are thick made of high quality material.