Head Maria 23 Junior Series Tennis Racquet The Maria 23, named after Maria Sharapova, is the perfect racquet for girls between 6 and 8 years who want to get a very first feel for the sport. This racquet is ideal for that very first training session in school or a spontaneous game on the streets. Suitable for most kids 6 to 8 years old depending on their height. Racquet comes prestrung by the manufacturer and includes a cover with shoulder strap.