Pack Of 3 - Each pack comes with a set of 3 pet bells,enough bells to place for pet training. Superior Material - Our training bells for pets are made of metal, with a painted finish and prevent rust. Clear Ring - The metal bell makes the sound clear and loud. Easy to use - No installation required,place Pet Bells on any flat place. Perfect tool for your pet - Patience for training Most pets are able to learn to knock the bells for go out, eat or have a drink.