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. It provides endless creative building possibilities and encourages spatial thinking and problem solving. Each of the seven different colored blocks has a unique function; and it's the world's only kinetic marble run. It has won “Spiel Gut” (Good Toy) Award and Oppenheim Toy Portfolio Platinum Award. Providing over a thousand happy playing hours, Quadrilla is worth every penny. All Quadrilla marble run sets are crafted with heirloom quality birch and rubber wood for long-lasting marble racing fun. Hape Toy finishes are all non-toxic, child safe and of the highest quality. Hape constructs their toys using FSC accredited wood products. Hape toys stimulate children through every stage of development and help nurture and develop their natural abilities. All Hape products meet or exceed all applicable safety standards. Xcellerator combines speed and spin. It features a spiraling funnel, a mix of straight and curved rails and ten accelerators to challenge Quadrilla builders in new directions and dimensions. Spirals, curves, straightaways, accelerators and a seesaw combine to make Quadrilla's Xcellerator the pinnacle of speedy marble run construction sets. Quadrilla's Xcellerator will make any mopey marble put the pedal to the medal with it's velocity-increasing design. Quadrilla's Xcellerator can be combined seamlessly with Quadrilla's other marble run sets.