Description: The Luminousball will flash, which bring pleasure for pets Material: The dog ball is made of Silicone, non-toxic and bite resistant Provide fun and exercise for your dog, remove anxiety and stabilize emotions Great training toy for you to interact with your pet dogs, it does good to improve puppy's intelligence. This product contains two CR 2032 electronic batteries. Specification: Material: Silicone Diameter: Approx.7cm/2.76inch Diameter: Approx.5cm/1.97inch Package Includes: 1 piece Dog Ball Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.