For daring marble run constructions, you need a stable foundation. The 60-piece building block set expands the marble run and construction block assortment for little master builders who want to reach for the sky. The white building blocks provide the ideal contrast to the colorful track elements and balls of the Hubelino marble run and help to quickly and clearly distinguish the construction blocks from the track elements. In this way, the well thought-out color concept also provides better orientation and structure for the young master builders - both when constructing and when cleaning up.