The Kong Wobbler interactive dry food dispensing toy sits upright until pushed by a dog’s paw or nose and then periodically dispenses tasty rewards as it wobbles, spins and rolls. The unpredictable movement keeps the toy challenging. Can also be used as an alternative to a dog bowl to help slow and extend mealtime while providing exercise and brain stimulation for your dog or puppy. Unscrews for easy filling and cleaning. Made from high grade, extremely strong plastic. This product comes highly recommended by my two dogs.