KONG Genius toys come in three sizes and two shapes, and can be interconnected to create new configurations for added challenge. Made in the USA of a durable, non-toxic, FDA food-approved TPR material, these toys are perfect for average chewers. Use with any KONG Stuff'N product, including KONG's IQ Treats, made of 100% baked salmon. Or, fill with food and use as an engaging mealtime feeder. KONG Genius toys help combat boredom and separation anxiety, and are great for puppies and adult dogs alike.