Disclosed herein is an aluminum alloy composition consisting essentially of, on the basis of total weight of the composition, 13 to 28 wt % of silicon, 1. An manufactured device under inspection is positioned under an irradiating beam of X-rays. The invention proposes that the second part be permanently connected to the wiper blade. The holder includes a holder body and defines a groove disposed along the holder body. In certain cases, a single catalyst may be used to effect both xylene isomerization and olefin removal.