"Quick Start 60" Orange Balls are designed for 60-foot USTA QuickStart & 10 and Under Tennis. They are the same size as regular tennis balls, but bounce at a speed midway between our "Quick Start 36" Balls and regular tennis balls. These "Quick Start 60" Orange level balls are available in 36-ball and 72-ball color-coded buckets. Ideal packaging for easy use and storage. All buckets now shipping with improved new hinge design for easier ball access and storage. These felt balls are USTA approved for QuickStart tennis format.