The Volkl Revolution Junior 21 Inch Tennis Racquet is a great option for beginners hitting the court for the first time or progressing juniors moving up in racquet size. The Volkl Revolution Junior 21 Inch Tennis Racquet provides young juniors great comfort, as the specs are made just for them! Allow young ones to fall in love with the game with the Volkl Revolution 21 Inch Tennis Racquet! The 21 inch tennis racquet is best suited for ages 5 to 6 years of age and 3ft 4in to 3ft 9in in height.