The fund, under normal circumstances, invests at least 80% of the fund"s net assets in financial instruments, that, in combination, provide 3X daily inverse (opposite) or short exposure to the index or to ETFs that track the index, consistent with the fund"s investment objective. The index is a market value weighted index that includes publicly issued U.S. Treasury securities that have a remaining maturity of greater than 20 years. It is non-diversified.