Air KongŪ Squeaker Donut - Dogs were born to chase. Kong has taken the most popular dog toy of all time and added a noisy wild side! Air Dog Toys are just what they look like: 100% pure tennis balls, made in the same factory, using the same materials as any high-quality tennis ball. The result is an affordable, super-rugged fetch toy. Give it a squeeze! Sizes: Small - 3.5", Medium - 4.75", and Large - 6.5".