Clearly engaging, clearly rewarding, clearly fun! This is Planet Dog's fresh take on the stimulating puzzle craze. Their interactive brain teaser is designed for long-lasting play, with a pliable, Orbee-Tuff® outer shell, and unique inner maze. Stuff with treats and enjoy! This toy is intended for puzzle-play, not chewing. To clean, fill with hot water, shake vigorously and rinse. Non-toxic and recyclable. 5" diameter.