Strategy. The Fund employs a passive management or indexing investment approach designed to track the performance of the Index. The Fund generally uses a representative sampling strategy to achieve its investment objective, meaning it generally will invest in a sample of the securities in the Index whose risk, return, and other characteristics resemble the risk, return, and other characteristics of the Index as a whole. Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in U.S. Treasuries that have a remaining maturity of seven to ten years and investments that have economic characteristics ( i.e. , risk and return characteristics) that are substantially similar to the economic characteristics … Show more… The Fund employs a passive management or indexing investment approach designed to track the performance of the Index. The Fund generally uses a representative sampling strategy to achieve its investment objective, meaning it generally will invest in a sample of the securities in the Index whose risk, return, and other characteristics resemble the risk, return, and other characteristics of the Index as a whole. Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in U.S. Treasuries that have a remaining maturity of seven to ten years and investments that have economic characteristics ( i.e. , risk and return characteristics) that are substantially similar to the economic characteristics of such Treasuries. The Index is composed of fixed-rate coupon U.S. Treasury securities maturing in seven to ten years or with remaining maturities between seven to ten years. The Index, which was created and is maintained by Bloomberg Index Services Limited (the Index Provider), is designed to measure the performance of a portfolio composed of public obligations of the U.S. Treasury that have nominal fixed rate coupons and remaining maturities of seven to ten years (the maturity range), excluding amounts held by the Federal Reserve system. Treasury bills, inflation-linked bonds, floating rate bonds, Separate Trading of Registered Interest and Principal of Securities (STRIPS), and state and local government series bonds are excluded from the Index. The Index employs a laddering approach to select its constituents. Each quarter the Index selects one Treasury security maturing in each quarter represented in the maturity range. If there are two or more Treasury securities within a given maturity quarter, then the most recently issued security is selected for inclusion in the Index. As a result, the Index generally will be composed of 12 constituent securities at each reconstitution (unless there are no eligible securities for a given maturity quarter). The constituent securities are equally weighted at the time of selection and then rebalanced at the end of each month. Each quarter, the Index is reconstituted, with a security being removed and replaced by another to maintain the ladder. For example, the constituent securities with the shortest amount of time to maturity ( i.e. , less than seven years) are removed from the Index and new securities with a longer amount of time to maturity ( i.e. , ten years) are added to the Index. To the extent the Index is concentrated in the securities of companies assigned to a particular industry or group of industries, the Fund will seek to concentrate its investments ( i.e. , invest more than 25% of its net assets) in such industry or group of industries to approximately the same extent as the Index. Show less