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A complete scientific kit to discover all the secrets of four-wheeled off-road vehicles. Featuring 2 dynamic models of a dune buggy and quad to build, children can discover the way transmission mechanisms work. Contains more than 130 interchangeable components including: complete differential, gears, rims, tyres, panels, bars and pins. In addition to the assembly instructions, a sheet with lots of interesting scientific facts about off-road vehicles and the mechanics of internal combustion engines