The Quercetti Skyrail 'Suspension' marble track is a nice basic set, consisting of 132 parts. The unique and ingenious cable system that supports the track is easy to set up and can ensure that marbles roll down faster or slower. The use of different sizes of marbles and materials also ensures that children make interesting observations, experiments and discoveries in the world of physics (speed, gravity, friction). All this makes it a marble track of exceptional and unique educational value that guarantees hours of fun. Includes marbles and a detailed instruction booklet. Suitable for children from 6 years.