The Quercetti Skyrail 'Suspension' marble run is a beautiful basic set, consisting of 132 pieces. The unique and ingenious cable system supporting the track is easy to set up and can accelerate or decelerate the marbles as they roll down. Furthermore, the use of different marble sizes and materials allows children to make interesting observations, experiments, and discoveries about the world of physics (speed, gravity, friction). All this makes it a marble run of exceptional and unique educational value that guarantees hours of fun. Marbles and a detailed instruction booklet are included. Suitable for children ages 6 and up.