The original and still the best Petsport Tuff Balls are industrial strength tennis balls made especially for dogs, with extra thick natural rubber walls for a better bounce and non-toxic polyester felt that goes easy on a dogs teeth. Industrial strength tennis balls built for dogsExtra thick natural rubber walls enhance durability & bounceNon-toxic polyester felt is colorfast & non-abrasiveWill not stain carpet or wear down teethMore Than a Tennis BallUnlike regular tennis balls, Tuff Balls contain no added chemicals for bounce and are made with colorfast dye that won't run or stain carpets. All components of Tuff Balls made from quality materials and safety tested to make sure they're completely harmless for your pet. Dimensions: 2. 5" each.