By freely designing GraviTrax ball paths and studying the rolling behavior of balls, the understanding of science is sharpened and gravity can be experienced up close. The GraviTrax universe includes three exciting lines - CORE, PRO and POWER. All GraviTrax lines and products can be freely combined. The GraviTrax universe can be endlessly expanded through countless expansions with classic building blocks or rocks that enable special actions and tricks. This means everyone can tinker, try things, and move forward. In the set: a cannon, three bullets and an instruction manual.