The GraviTrax PRO Extension Vertical makes it possible to build into the height and thus brings more possibilities in the GraviTrax path.THE PRO Extension Vertical contains many different components to build into the height. Combined with any GraviTrax Starter Set, THE PRO Extension Vertical brings even more possibilities and complexity to the GraviTrax universe. On how many levels can the balls roll?GraviTrax is a flexible, interactive ball track system for children aged 8 and over: With GraviTrax, children, young people and adults are not only building simple ball tracks. You create unique ball track worlds. By freely designing the ball tracks and exploring the rolling behavior of the balls, the understanding of science is strengthened and gravity can be experienced at first hand. The GraviTrax Universum contains three exciting lines - CORE, PRO and Power. All GraviTrax lines and products can be combined freely. With innumerable expansions with classical components or stones, which e