This is a set of commercial structural rods used in reconstructing the full-scale model of the Wilkinson Microwave Anisotropy Probe (WMAP). The full object contains flight and flight-like parts, reconstructed and reassembled for display.
NASA Goddard transferred this to the Smithsonian in 2006.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.