Description Mechanics Lab Roadster & Dragster assembly kit. A great scientific kit to discover the secrets of these powerful two and four-wheeled vehicles. Build these 2 dynamic models and then check out the transmission mechanisms.  Contains more than 130 interchangeable components including: Gearbox Gears Rims Tyres Elastics Bars Brushes Sheaves and Pins Assembly instructions Sheet containing lots of scientific information on aerodynamics and the mechanics of internal combustion engines. Recommended for Ages 8+