Are you buying Lithium-Aluminum Alloy?

Al-Li alloys are a series of alloys of aluminium and lithium, often also including copper and zirconium.
Al-Li alloys are primarily of interest to the aerospace industry due to the weight advantage they provide. They are currently used in a few commercial jetliner airframes, and the AgustaWestland EH101 helicopter.
The third and final version of the U.S. Space Shuttle's external tank was principally made of Al-Li. In addition, Al-Li alloys are also used on both the Atlas V and Delta IV EELV rockets, and before its cancellation were to be used by NASA for Project Constellation, primarily, on its Ares I and Ares V rockets, as well as the Orion spacecraft.
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