This ball is molded from KONG's black Extreme rubber, a natural rubber formula developed to hold up under repeated chewing and rough outdoor play. Its rounded shape gives it an energetic bounce that keeps games of fetch lively, while small openings on each end lighten the ball and allow air to pass through as a dog carries it. The rubber is puncture resistant, helping the toy withstand gnawing without splitting apart during normal use. It is manufactured in the United States using globally sourced materials. The toy ships as a single ball with no assembly required and is intended for use under an owner's supervision. Because the opening is narrow, the ball is not designed to be filled and used as a stuffable treat dispenser in the way some other chew toys are.