Under normal circumstances, the fund invests at least 80% of its net assets in U.S. Treasuries that have a remaining maturity of one to three years and investments that have economic 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 1 to 3 years or with remaining maturities between 1 and 3 years. The fund is non-diversified.