Head 25" Ash Barty Kids Junior Tennis Racquet 

This racquet is typically used with Green Balls which are at 75% compression of the standard Yellow Ball and are designed for players aged 9-11 yrs old.

These balls are designed to land within the hitting zone (roughly waist height) for players in this age bracket

Green balls are the same size as a standard tennis ball and are used on a standard tennis court with no modifications at all