The Tourna Tenn-Tube gives kids a fun and easy way to pick up and store tennis balls. Lightweight, durable tube features a rubber flange to allow balls to enter the tube without falling back out. Fence hook for storage and a removeable elastic band for secure transporting. This Tenn-Tube includes 21 stage #1 tennis balls. Stage #1 low compression balls bounce 25% slower than regular tennis balls. Ages 10+, Full Court. Tourna Stage #1 balls meet ITF and USTA Quickstart specifications.