At Babolat, making tennis fun for kids is our mantra. That's why we created racquets like the B-Fly, to help your kid have fun faster on court, with a cool-looking design they will love. Learning the fundamentals is important too, so we integrated educational tools directly onto the racquet to help your kids master the basics of tennis. It's no surprise the B-Fly is recommended by 6000 coaches around the world. The B-Fly 21 is recommended for girls whose height is between 105-120 cm (41.5-47 in.).