KONG Sport Balls are better than a tennis ball. Made with extra-thick rubber walls, these toys are tough enough for serious games of fetch. Give them a throw and watch your dog go crazy for these rugged, bouncy balls. Tougher and safer than a tennis ball Extra bouncy for hardy games of fetch No squeaker IMPORTANT: Designed for light/moderate chewing. For tough chew sessions, try KONG rubber toys. Supervised use only. Remove all packaging. Discontinue use if damaged.