All of these paper models are about formula one (F1). Formula One, also known as Formula 1 or F1 and referred to officially as the FIA Formula One World Championship, is the highest class of single seater auto racing sanctioned by the Fédération Internationale de l'Automobile (FIA). The Formula One series originated with the European Grand Prix Motor Racing of the 1920s and 1930s. The "formula" is a set of rules which all participants' cars must meet. Formula One was a new formula agreed after World War II during 1946, with the first non-championship races being held that year. A number of Grand Prix racing organisations had laid out rules for a World Championship before the war, but due to the suspension of racing during the conflict, the World Drivers' Championship was not formalised until 1947. The first world championship race was held at Silverstone, United Kingdom in 1950. A championship for constructors followed in 1958. National championships existed in South Africa and the UK in the 1960s and 1970s. Non-championship Formula One events were held for many years but, due to the increasing cost of competition, the last of these occurred in 1983.