This Dunlop AO 18x4 Ball Carton - 72 Balls is a high-performance tennis ball. One thing underpins it all, the Dunlop tennis ball. Obsessively crafted, meticulously engineered, officially endorsed. Designed to deliver a world-class performance on any tennis court surface. These tennis balls come with an HD Pro Cloth exterior which ensures these balls maintain their outstanding characteristics for much longer than a regular tennis ball. A professional-quality tennis ball that all ages and abilities can enjoy, the bulk buy options make them the perfect fit for clubs, academies & tournament organizers.