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 blocks. Fully compatible with major brand bricks, the Elements set can give old toys new life. The combination of this set with a bunch of your current bricks allows you to recreate a huge marble run construction from the best-selling Hubelino 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 marbles do not fly out of the curve at full speed. Like all products from Hubelino, the marble run elements are manufactured in Germany under the highest quality standards. For ages 8 and up. WARNING: CHOKING HAZARD -- Toy contains a marble. Not for children under 3 yrs. CHOKING HAZARD -- Small parts. Not for children under 3 yrs.