Each liquid-filled ball features a soft outer shell that serves as a flexible casing for the liquid, allowing for an easy, comfortable grip. Rather than a central metal weight such as standard Astrojax, the dynamics of the Aqua's fluid flows lower the rotational inertia of the balls to provide smooth orbits and prevent tangling of the string around the center ball. The string length is adjustable and stringbuds at each end of the string allow for quick and easy tuning. Launch date: November 26, 2007.
— “The Astrojax Aqua is a unique and patented skill toy with no competition, building upon the excitement and success of earlier versions of Astrojax, Jim Marielli of Astrojax USA told TDmonthly.