The FORT XTRA LIFE ball is a premium pressureless tennis ball, specially developed and designed in collaboration with SLINGER, to provide players around the world with the ideal tennis ball to improve their game while practicing with the SLINGER BAG. A thicker compound construction provides a long lasting and durable rubber core for consistent performance, for hours on end. Thanks to the ultra-high specification and ultra-visible cloth technology, tennis players will enjoy optimum control and durability when playing with this tennis ball. 72 premium pressureless tennis balls. Designed for an ultra-durable performance on all surfaces. The balls are individually packed in a strong, ECO FRIENDLY, paper bag with a cardboard box around it. The FORT XTRA LIFE is designed and packaged with sustainability in mind. Reduce, Reuse, Recycle.