Another segment on James May’s Top Toys show was devoted to the Scalextric race cars. The Scalextric cars are typically sold as a set containing enough track to make a circuit, the necessary power supply and throttles and two cars. The cars are usually based on real vehicles from Formula 1, A1 Grand Prix, NASCAR, rallying, touring, or Le Mans, or based on ordinary road going cars. A number of novelty sets have been produced; for example, horse racing sets and 360 degree sets. The latter, produced sporadically since the 1960s, have a specially-made guide that enables the car to run back the way it has come by spinning through 180 degrees.