QuickStart 60 Balls are designed for 60-foot USTA QuickStart Tennis. * They are the same size as normal tennis balls, but bounce at a speed faster than QuickStart 36 balls and about 50% slower than normal tennis balls. * Meets all specifications for the following organizations: " USTA QuickStart Tennis: 60 Foot Orange Level " ITF Play and Stay: Stage 2 (Orange).