The Quadrilla Ultimate is a dizzying mishmash of curves, spirals and drops which will put your marbles through a whirlwind marble race. As with other Hape Quadrilla Marble Run Construction Sets, it combines easily with other Hape Quadrilla products for expansion and unique combinations that will enhance your child's play experience. Hape Quadrilla is a high-quality wooden marble run construction system. It provides quality time for the whole family to play together. The best gift for your loved ones. All Quadrilla marble run sets are crafted with heirloom quality birch and rubber wood for long-lasting marble racing fun. For ages 4 years and up.