The Radical Jr. series helps children start their tennis journey in the most comfortable way. The aluminum racquet features the unique Damp+ insert, which isolates the impact for fewer vibrations. The Radical 21 is perfect for kids between 4 and 6 years who want to master the versatile game. The racquet's exciting new design and upside-down logo execution underline the versatility of the racquet and allow you to conquer the courts anytime.