With the 98-piece Marble Run Elements Set M, your Hubelino pi marble run system can be extended as desired or can be used to breath new life into your existing building block box. With the 98-piece Marble Run Elements Set M, your Hubelino pi marble run system can be extended as desired or can be used to breath new life into your existing building block box. The combination of this set also allows you - if enough components from other manufacturers are available - to recreate the huge marble run construction from the Marble Run Set XL. With the 10 included tunnel adapters you can simply stack all the components on top of each other, so that the steel marble does not fly out of the curve at full speed. All marble run elements are compatible with common components from other manufacturers and can thus be creatively combined with your existing components and theme worlds. Like all products from Hubelino, the marble run elements are manufactured in Germany under the highest quality standards. The Hubelino pi marble run system combines daring physics tricks with creative construction fun. The fascination of constructing tricky marble run racetracks is only topped by the high speed and action-packed tricks and stunts of the steel marble. And best of all: Hubelino pi can be combined with building blocks, figures and theme worlds from other manufacturers, because Hubelino pi is fully compatible with common plug-in systems.