The MX series is the next generation of the Astrojax "free-dimensional" swinging ball toy! The MX Sport series is an aerodynamic, modular system that takes Astrojax to a new level.Not familiar with Astrojax play? Astrojax is a fascinating game that challenges one"s skill and coordination. The premise is simple: There are three orbiting balls on a string. The results and choices for play are practically endless!All MX series parts are interchangeable and compatible with other sets, so players can mix and match colors in the MX Sport and MX Pop lines!Start with simple moves and learn increasingly complex and fun-to-watch tricks, or move onto free-style play.