Screws, bolts, wingnuts, wheels and perforated plates, made of resistant shatterproof plastic , can be assembled without special tools. All a child needs is a pair of hands and a lot of imagination. The box contains everything a child needs to build a world of cars, helicopters, cranes or anything else that comes to mind. The tecno jumbo building set stimulates coordinations as well as logic and creativity, helping children to understand basic principles of mechanics while enjoying themselves.