The Jolly Pets Teaser Ball is an all-in-one ball that features a movable interior ball inside a rounded outer cube. It is perfect for large dogs that are 60-90 lbs and for those who want to add some extra fun to their lives. The ball floats in the water for retrieving and fetching and is easy for dogs to grip, lift, and carry. It is made from a durable material that is safe for pets and children.