Unique Kong® Biscuit Balls has a hollow center and four bone-shaped ports that hold dog’s favorite treats. Insert some tasty morsels, and this durable chew toy will entertain dogs for hours. Made of 100% natural, puncture-resistant rubber. Provides a great way to promote good behavior while satisfying dog’s urge to chew. Made in the U.S.A. Small is ideal for small dogs and puppies up to 20 lbs. Large is perfect for medium and large dogs.