The BMW 7 Series is a full-size luxury sedan produced by the German automaker BMW since 1977. The 7 Series is BMW's flagship car and is only available as a sedan. It traditionally introduces technologies and exterior design themes before they trickle down to other models in BMW's lineup. Unlike the 3 Series and 5 Series sedans, BMW has not produced an M model for the 7 Series. However, in 2014 an "M Performance" option became available for the 7 Series. The sixth generation of 7 Series has been in production since 2015. It was revealed on June 10, 2015 at BMW's headquarters in Munich. An official public reveal took place at the 2015 International Motor Show Germany. It is the first car of BMW Group to be based on the modular OKL platform (Oberklasse, German for luxury class). The OKL platform adopts technology first introduced in BMW i models, namely the introduction of carbon-fiber-reinforced polymer as structural chassis components. As part of BMW's strategy of introducing plug-in hybrid variants for all future car models, both, the short and long-wheelbase models will be available with hybrid powertrains under the designations 740e and 740Le in 2016.