A truly mesmerizing marble-track experience! Each set is made up of hollow stacking cubes and a variety of perfectly flat tracks. The paths cut out of each track widen almost imperceptibly from one end to the other, creating an invisible slope that propels the marbles forward. Watching them go is like magic in slow-mo! Get the fullest experience with the 124-piece Deluxe set with four even bigger guided builds. Or, collect them all, combine them, and turn your Trestle Tracks into a Trestle Metropolis! Get creative and discover the wonders of simple engineering with Trestle Tracks. Includes 2 catchers, topper, 90 risers, 10 stainless steel marbles, 18 unique tracks, and 2 base grids.