The Wilson Starter Foam mini tennis balls are dedicated for the youngest players aged between 2 and 8 designed as a part of the Play & Stay program. The balls are excellent for learning the basics, practicing timing and focus, plus they allow for proper control over strokes since they are slower and offer 25% less bounce. The balls are suitable for 36ft courts and small playgrounds. Furthermore, they are approved by the ITF and supplied as 1-dozen (12 tennis balls).