The FineInno 4 pcs Light Up Dog Balls are perfect for any dog owner who wants to give their pet an interactive toy that will help them stay active and entertained. Made of high quality silicone material, these balls are durable and easy to clean. With a diameter of 5 cm, they are a little smaller than a standard tennis ball. They have a flashing feature that will attract the attention of any dog, even in the dark. These balls last 10 seconds and can be used multiple times a day.