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A full set to discover child the secrets of 2 powerful engines. Includes instructions for assembling two dynamic models: 1 buggy and 1 quad. The child learns about the mechanisms in the drive system. It contains more than 130 interchangeable components, such as: differential, gearbox, gears, rims, tires, wheels, rods, pulleys, etc. The instruction manual is illustrated and guides the child step by step with plenty of scientific information and knowledge about off-road vehicles and internal combustion engines.