A truly complete scientific kit to discover the secrets of these powerful two & four-wheeled vehicles. 2 dymic models can be built: a dragster & a roadster, & transmission mechanisms can also be checked. Contains more than 130 interchangeable components including: gearbox, gears, rims, tyres, elastics, bars, brushes, sheaves & pins. In addition to the assembly instructions, a sheet with lots of scientific information on aerodymics & the mechanics of interl combustion engines.