Sponge titanium is used for aircraft fuselage parts, engine parts, and other aerospace applications. It is also called Premium Grade titanium because of its extremely strict quality standards. Only two Japanese companies, a Kazakhstani manufacturer, and a Russian manufacturer (VSMPO) are capable of producing sponge titanium for aircraft. Prices are quoted in U.S. dollars per kg, and MIRU regularly surveys price trends through stakeholder interviews.