The Wilson Roger Federer Tennis Racket is crafted for legends. The tennis racquet matches sleek style with excellent performance. The tennis racquet includes a bumper guard along the top of the frame to help prevent damage to the surface edge. The tennis racquet is suited for kids aged 5 and 6 years. It has QuadriForm Technology that stabilizes swing for better consistency. About Wilson: Wilson has been a leader in the tennis industry for over a century, continually pushing the limitations of innovation and creativity to deliver the best tennis rackets in the world. Wilson tennis rackets are popular not only on neighborhood and club tennis courts but also on the main stages of the sport. What age is a 21 inch tennis racket for? The 21-inch is the next size up and is ideal for kids aged 5-6 years.