[Durable and safe material] The dog bells are made of sturdy nylon material that is strong, durable and chew resistant. The belt is environmentally friendly, safe, non-toxic and odorless and will not harm your pet. And the bell is made of a metal composite which is loud and crisp, you can hear it through the door and the wall. [Adjustable Length] The length of the puppy bells can be easily adjusted to fit the size of your pet. Length 33’’ to 43’’. [Effective Training Tool] With the simple training guide, dog bells are an easier and more effective way for your dog to communicate! Teach the animal to ring a bell when it goes out or goes to the bathroom instead of scratching the door and barking for your attention. Use a gentler method to create intimacy between you and your pet. [Clear and solid hard bell] The bells are made of high quality stainless steel, the sound is loud and clear, and it is not easy to be bitten by pets. Extra loud sound will grab your attention anywhere in the
