Briton Pressure Less Tennis Balls with Carrying Bag (Pack of 12) PRESSURELESS: Britons Tennis Balls are pressure less & wont lose their bounce like standard balls. They actually gain bounce over time, for maximum, long lasting performance. STURDY & DURABLE: For long lasting performance, our tennis balls are constructed from a durable rubber shell structure that delivers amazing bounce that only improves with time. CONVENIENT CARRYING BAG: Britons Tennis Balls come in a convenient bonus zipper carrying bag that makes it easy for you to store and locate your tennis balls. LARGE SUPPLY: This package comes with 12 tennis balls so you always have an extra on hand. They are ideal for parties, trips with large groups, or teaching lessons to a group. GREAT FOR RECREATION: Britons Tennis Balls make great gifts for sports lovers & can be used for tons of activities including lessons, practice, throwing machines & playing with pets.