Material- Our pet training bell is made of plastic and metal, the surface is reflective, not easy to rust, very attractive to pets. SIZE- Our training bell is 7.2cm in diameter and 5cm in height. The above dimensions are all measured by hand, please refer to the actual product. Easy to Use- No installation required, just place the bell on a flat place. It's easy to teach your puppy or kitten to press the flat buttons with their paws or nose. Wide Range of Applications- Potty training, home training and burglary can also be used as a help desk call bell in shops, restaurants, bars and shops. hotels. Product Description Specification: Material: metal and plastic Color: light green, bright blue, bright gold, bright red, bright purple Size: 7.2cm or 2.83" in diameter, 50mm 5cm or 1.97" in height, suitable for small dogs or cats. Uses: Can be used as a meal bell, dog training bell Package contents: Five animal training bells