The BMW Z models are a line of roadsters manufactured by German automaker BMW. The Z stands for zukunft (German for future), and has been produced in four different series with six generations consisting of roadster, coupé, sports car, and concept variants. The BMW Z4 (E89) is the second generation of the BMW Z4 range of two-door roadsters, and was produced from 2009 to 2016. The E89 replaced the E85/E86 Z4 and is the fourth model in the BMW Z Series. The E89 Z4 was the first Z Series model to use a retractable hardtop roof, which meant that there were no longer separate roadster and coupé versions of the car. The E89 was the first BMW automobile to be completely designed by two female designers — Juliane Blasi (exterior) and Nadya Arnaout (interior) — in 2006.