The SPORTSPET tennis ball has been developed to be one of the 'bounciest' tennis balls on the market. We have developed a high rubber content ball which increases the bounce. The higher the bounce, the more fun for your dog and with the squeak they're even more fun. We've even improved the durability so your dog can train and enjoy for longer.More Bounce, More Durability, More Squeak, More fun! Balls are packed in a handy reusable drawstring mesh bag.Medium - 65mm