KONG Signature Ball 4-Pack delivers four different flavors of fetch, each with a unique texture for high-flying variety to keep pups playing. These super-sturdy, ultra-bouncy balls offer long-lasting action, satisfying dogs chasing and retrieving instincts with tons of healthy exercise. Some squeak, some do not. Special felt on KONG Signature Sport Ball is gentler on teeth and gums than regular tennis balls for safer play.