Rolls-Royce Holdings plc specializes in the design, manufacture and marketing of engines for the aeronautics, marine, and energy sectors. Net sales break down by family of products as follows: - commercial aero engines (50.6%); - military military aero engines, naval engines and submarine nuclear power plants (25.3%); - power and propulsion systems (23.9%): intended for power plants; - other (0.2%). Net sales are distributed geographically as follows: the United Kingdom (14%), Germany (5.5%), Europe (15.3%), the United States (30%), North America (1.4%), China (7.4%), Asia (13.2%), Middle East (6.2%), Central and South America (2.7%), Australasia (2.2%) and Africa (2.1%).