Wiggly Giggly Geo Ball is a one-of-a-kind toy. Just a nudge with a nose and the Wiggly Giggly makes a hilarious noise. You and you dog will not be able to resist these entertaining toys as they wiggle and giggle across the floor! Unique, non-electronic "air tubes" emit a hysterical giggling sound when toys are rolled and played with. No batteries! Made from durable, PVC plastic, each ball is weighted to roll in unpredicatable patterns. However, this toy is not for chewing. If your dog is a chewer, we recommend keeping this toy picked up until playtime. Wiggly Giggly Geo Ball measures 7 inches in diameter, good size for most dogs.