The investment seeks to track the investment results of the Dow Jones U.S. Select Oil Equipment & Services Index. The fund generally invests at least 90% of its assets in securities of the underlying index and in depositary receipts representing securities of the underlying index. The underlying index measures the performance of the oil equipment and services sector of the U.S. equity market and includes companies that are suppliers of equipment or services to oil fields and offshore platforms, such as drilling, exploration, seismic information services and platform construction. The fund is non-diversified.