Hit Zone Jr Tennis Air Tee - HZ-T500 - Balls Floats In Mid-Air! 10 Ten & Under Training Aid- Drills. Includes Bonus 14.5" Sleeve Practice Solo! The Hit Zone Jr provides a great training tool to practice year round at home! Set up in your driveway, garage, or basement, and practice year round! A durable fabric sleeve delivers the air! Your racquet will swing right through it! No other tennis training product floats a ball in mid-air. Kids will love practicing on the Hit Zone Jr! The training ball floats and spins in mid-air, creating a fun experience and a unique training aid for your next superstar! The Hit Zone Jr for tennis provides a great training aid to practice your swing and your foot placement. Light & compact! Easy to take with you to the courts. Operates on a standard 110 outlet.