The Tourna Ballport with Stage-1 Kids' Balls offers a durable and convenient storage and transportation option for most tennis balls. It features a patented rolling bar design along the bottom, making it quick and easy to pick up balls after use. Additionally, this container's two sliding bars along the top lock in place, to provide a higher degree of security. This tennis training aid is crafted with durable polypropylene plastic for greater stability and durability, which allows for a longer lifetime of use. This set comes complete with a collection of 70 stage-1 balls, which are ideal for tennis players of ages 11 and up.