The investment seeks to provide total return that closely corresponds, before fees and expenses, to the total return of The BofA Merrill Lynch Long US Treasury Principal STRIPS IndexSM. The fund invests at least 80% of its total assets (exclusive of collateral held from securities lending) in the component securities ("Component Securities") of The BofA Merrill Lynch Long US Treasury Principal STRIPS IndexSM (the "underlying index"). The underlying index is an unmanaged index comprised of long maturity Separate Trading of Registered Interest and Principal of Securities ("STRIPS") representing the final principal payment of U.S. Treasury bonds.