Description We designed this leather + brass dog doorbell because many customers wanted a more upscale material. It's a step up from the polyester + iron bell combination found on the market, making it not only a functional product for potty training, but also a stylish decorative detail! Affordable and professional quality. The bells are made of high-quality copper and the inner ball is made of polished silica polymer, which makes the bells sound clear 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 it to ring the bell when it needs to go out, instead of barking or scratching. You can easily follow our three-step process and have your furry friend 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 the dog doorbell help you in this endeavor!