The outside of the ball is made of high quality latex, non-toxic and eco-friendly, good safe for your dog’s health. It is strong and durable, good bite resistant. L Inside is padded with cotton so the ball can spring back into shape easily. Ball diameter: 9.5cm The surface of the ball has small spikes that can clean the teeth when the dog bites the ball. The sound ball when being pressed, which can attract dog’s attention. Can be used indoors and outdoors, well strengthen the relationship between dogs and their owners. Two shapes to choose from: football shape; rugby shape according to your needs.