The investment seeks to track as closely as possible, before fees and expenses, the price and yield performance of the Barclays U.S. 3-10 Year Treasury Bond IndexSM. The fund invests at least 90% of assets in securities included in the index. The index includes all publicly-issued U.S. Treasury securities that have a remaining maturity of greater than or equal to three years and less than ten years, are rated investment grade, and have $250 million or more of outstanding face value. The securities in the index must be denominated in U.S. dollars and must be fixed-rate and non-convertible.