The fund seeks to track the performance of the MSCI US Investable Market Materials Index, an index of stocks of large, medium-size, and small U.S. companies within the materials sector. The sector is made up of companies in a wide range of commodity related manufacturing industries. Included within this sector are companies that manufacture chemicals, construction materials, glass, paper, forest products, and related packaging products, as well as metals, minerals and mining companies, including producers of steel.