This amazing collection of marble runs is just perfect for techno-mad boys and girls! Hours of fun are guaranteed - an ingenious puzzle to put together, the finished kit has a truly hypnotic appeal as the powered chain drive returns the marbles again and again! Sets come graded according to piece-count and relative difficulty whilst components are inter-changeable so you can combine sets. The model with 5,000mm of track! With an Archimedean Screw lift and 5 metre track - this set is ideal as a starter kit for the budding young engineer. Suitable for Ages 8