We designed this leather + brass bell combo dog doorbell because many customers wanted a more premium material, it's a step up from the polyester + iron bell combo on the market, which makes it not only a functional product for potty training, but also a great looking decorative piece! Fairly priced and professional quality, the bells are made of high quality copper and the inner ball is made of polished silica polymer, making the bells sound crisp and bright, just like Christmas bells. The belt and connecting parts are fully tested, sturdy and reliable to withstand the stress of the most playful dogs. The best way to train your puppy is to teach them to ring the bell when they need to go outside, rather than barking or scratching. You can easily follow our three-step process and have your fur baby trained in no time. Potty training shouldn't be a stressful process for you or your puppy, but we know it can be difficult and our goal is to make the process as easy and enjoyable as possible! Let CATHYLIFE Dog Doorbell assist you in this endeavor! If you do not want to install a dog door on your own door, this puppy bell will be a good choice, it is easy to use, just hang on the doorknob to start interaction with your puppy. Beautiful leather and bell can also serve as a nice decoration, if hanging the bell on the door handle causes inconvenience. We promote environmental protection, rolled can make the package smaller and reduce the carbon emission. The rolled up belt may be temporarily uneven (characteristic of leather), don't worry, this is normal, just hang it up and let it stretch, it will be back to its original shape after 24 hours at most.