The index includes companies that have common stocks or depositary receipts listed on a U.S. stock exchange and that provide services to the oil industry. The fund invests at least 80% of its net assets in financial instruments, such as swap agreements, securities of the index, and ETFs that track the index and other financial instruments that provide daily leveraged exposure to the index or to ETFs that track the index which provide returns consistent with the objective. It is non-diversified.