Used at every Australian open event leading to the finals, the Dunlop Australian Open tennis ball is the official ball of the tournament and its designed to the highest standard to ensure maximum playability and feel. The ball offers excellent pressure maintenance, as well as increased visibility on the court with a bright quality-made felt. The ball is played by the best of the best players in the world of tennis, and with HD Core HD Pro cloth, it definitely delivers a significant performance boost. Additionally, it is suitable for multiple, various playing surfaces, and when played for a substantial amount of time, the ball still preserves excellent feel, proper bounce and delivers fantastic shot sensation. The balls are shipped in an AO can which contains four units.