The BMW i3 is a B-class, high-roof hatchback manufactured and marketed by BMW with an electric powertrain using rear wheel drive via a single-speed transmission and an underfloor Li-ion battery pack and an optional range-extending gasoline engine. The i3 was BMW's first mass-produced zero emissions vehicle and was launched as part of BMW's electric vehicle BMW i sub-brand. Styled by Richard Kim, the i3 uses a single five-door configuration with bodywork consisting of a passenger module of high strength, ultra-lightweight CFRP (carbon fiber reinforced plastic) glued to a lower aluminium module holding the chassis, battery, drive system and powertrain. The bodywork features two smaller clamshell rear-hinged rear doors. The i3 debuted as a concept at the International Motor Show Germany and production began in Leipzig, Germany. The i3 ranked third among all-electric cars sold worldwide