The KONG SqueakAir Ball combines two classic dog toys - the tennis ball and the squeaker toy - to create the perfect fetch toy. It will be a favorite in no time at all. The durable, high-quality SqueakAir tennis ball is gentle on your dog's teeth and is made with a special non-abrasive felt, compared to the abrasive material on normal tennis balls. SqueakAir Balls combine the fetch fun of a traditional tennis ball and interactive play of a squeaker toy for double the stimulation. This 4-pack of balls are perfect for medium-sized breeds and dogs of all ages.