ASTROJAX AQUA Blue is the next generation of Astrojax; based on a revolutionary fluid-flow design with a liquid core that provides even smoother orbits. The larger balls offer a unique playing experience and great visual impact.The balls glide almost frictionlessly along the new high-quality circular-weave strings. Sophisticated stringbuds let you easily adjust the length of the string and provide a whole new level of freedom when playing.Set comes with an extra-long replacement string and an additional stringbud are included.For ages 8 and up.