This copper bar, about the size of a Popsicle stick, was created on board the Soviet Mir space station as part of research on the benefits of microgravity in developing ultra-pure materials. The bar bears the inscription "cosmos (space) for the world" and a drawing of Soviet Buran space shuttle.
Cosmonaut Vladimir Dzhanibekov donated this bar to the National Air and Space Museum in 1991.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.