The looping element turns the world of balls upside down for a brief moment. The balls fly through the loop at rapid speed, suspending gravity for a moment. Combined with any GraviTrax starter set, the Looping element turns the balls in the ball track upside down. How much momentum does the ball need to make it through the loop? GraviTrax is a flexibly expandable, interactive marble run system for children aged 8 and over: With GraviTrax, children, teenagers and adults don't just build simple marble runs. They create unique marble run worlds. By freely designing the ball tracks and researching the rolling behavior of the 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 with each other. The GraviTrax universe can be expanded infinitely through countless expansions with classic building elements or stones that enable special action and tricks. This means everyone can tinker, try things out and push themselves further.