The BFly 21, which is lighter, easier to handle and more forgiving. Your future champion will love using this racquet with a fun, colourful design! To make learning to play even easier and help kids master tennis basics, we've added teaching tools to the racquet. It's no coincidence that the BFly is recommended by 6000 coaches worldwide. The BFly 21 is designed for players who are 110 to 125 cm tall.