All PoochieBells are handcrafted with USA-made, lead-free, smooth, safe, reinforced bells designed especially for your pooch. Dogs can clearly announce when it's time to go outdoors and relieve themselves with the help of these bells. They can easily learn to ring the bells whenever nature calls with a straightforward training program. Purchasing a set of Poochie Bells now will simplify the potty training process for your dog. https://apetsworld.com/products/poochie-bells