Specifications: This hollow plastic ball has a small bell inside, can make a sweet and pleasant sound to catch your pets attention. Put this small sound ball on your pets neck, and you can always know if it is at home. This small sound ball has small holes on the surface, is perfect for your cat and small dog to play with and wont harm their teeth and claws. This hollow ball is made of TPR material, is durable and non-toxic. Item Name: Dog Hollow Ball Toy Material: TPR Type: 1: Empty Ball, 2: with Bell, 3: with Tennis Ball (Optional) Features: Molar, Bite-resistant, Chew Toy, Hollow Diameter: 13cm/5.12" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Dog Hollow Ball Toy Or 1 x Dog Hollow Ball Toy 1 x Bell Or 1 x Dog Hollow Ball Toy 1 x Tennis Ball