The Green ball is an extension of Orange ball. It involves more challenging drills and creates greater consistency and tactical exploration. Fundamental and perception motor skills have developed to a point where the child is now working on better technique, quicker movement, anticipation skills and hitting the tennis ball with greater variety. Class duration: 60 minutes. Recommended racquet size: 25-27 inches. These racquets may be purchased at the Club Pro shop, Stringlab.