Air Kong Squeaker Tennis Ball is made especially for dogs with the squeaker hidden under the felt. Made from non-abrasive non-toxic felt so not to ruin the dogs teeth like regular tennis balls and be safe for the dog. The ball comes in two sizes, Medium for average dogs and Large for the larger breeds. The medium ball is 2.5" in diameter while the large is 3" in diameter. These items are not chew toys! Please do not leave your dog unattended and allowed to chew these items. May be harmful if ingested.