Product DescriptionMaterial: Nylon webbing + iron bellSize: Length 96cm, bell diameter 3.8cm, whistle 8*0.7cmColor: BlackPackage content: 1* Bell rope1. MAKE TRAINING EASY - Dog training bells are one of the simple and non-confrontational solutions for housebreaking your puppy. Using dog bells has proven to be an easier, more enjoyable, and winning way for your dog to communicate instead of barking, scratching, or being forced to resort to more intrusive methods.2. THREE ADJUSTABLE LENGTHS - We upgraded this dog doorbell to 3 lengths according to customer feedback, the older version with only 2 lengths, the shortest length is still too long for handles that sit lower. 3 snap buttons/buttons allow for longer length adjustment, so now you can turn it shorter.3. PREMIUM QUALITY - The housebreaking doorbell is made of heavy-duty nylon material, preventing tangles and withstanding strong pulls. 7pcs 1.4 large extra loud stainless steel bells, shiny and rattling, perfect hanging doorbells for housebreaking your puppy.4. SOLID AND DURABLE - These dog bells and belt are specially manufactured and carefully tested for durability. The belts are excellently stitched, durable, and chew-proof; The bells use plating technology to keep them shiny and not rust; The connection of the bells and the attachment points are thickly made of premium material.