Xcellerator combines speed and spin. A spiraling funnel, a mix of straight and curved rails and 10 accelerators 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. 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.