With the Quercetti Rollercoaster 150 pc Marble Run you can build the longest marble runs in the world, spanning up to 9 yards long, spectacular aerial pathways that will be the main attraction of your room. The mini tracks can be assembled in many different ways: some are illustrated in the enclosed in the enclosed manual, but you can invent many other ones freely expressing your creativity. With Quercetti Rollercoaster 150 pc Marble Run marbles don't travel only downward at constant speed like in old-fashioned marble runs, but can accelerate impressively down steep slopes then climb uphill until almost reaching a stop, roll quietly along flat plateaus, and then again deep down chilling plunges at full speed. The bestselling Quercetti Skyrail Rollercoaster is redesigned in such a way that most types of marbles, in various sizes and materials, can run along its tracks (2 types included in this box). Each marble type will run at different speeds and will allow you to observe, experiment and discoverer the world of physics forces and to understand intuitively its fundamental principals. This is actually an exceptional educational value that makes Skyrail unique and an irreplaceable learning instrument. Perfect for demonstrating gravity, speed, inertia, centrifugal force and other principles of mechanics and physics. This kids marble run set includes 150 pc. Parts colors and packaging design may vary.