This set includes all run elements which are needed to build the marble runs from our Mini Building Box and Basic Building Box. Perfect for the customer who already has enough building blocks at home. These sets will breathe new life into your existing building blocks, transforming them from a forgotten toddler toy into an advanced building component to aid in the construction of spectacular and dynamic marble runs! Made in Germany. For ages 4 and up. WARNING: CHOKING HAZARD - Small Parts. Not for children under 3yrs. WARNING: CHOKING HAZARD—Toy contains a marble. Not for children under 3yrs.