A set to build a compacting crane and nine other construction machinery models. It includes over 200 interchangeable components such as flat and bevel gear wheels, racks, differentials, worms, notched tires, bars, and panels. The bucket of the crane lifts thanks to the worm mechanism, and the car moves by turning the steering. The illustrated manual guides children in constructing the models and introduces them to the principles of mechanics and engineering. With the free app, many other applications can be discovered and built. Ideal for children aged 8 and up. Made in Italy.