The investment seeks to replicate as closely as possible, before fees and expenses, the price and yield performance of The Rogersä-Van Eck Hard Assets Producers Index. The fund normally invests at least 80% of its total assets in equity securities, which may include depositary receipts, of U.S. and foreign hard asset producer companies. It may concentrate its investments in a particular industry or group of industries to the extent that the Hard Assets Producers Index concentrates in an industry or group of industries. The fund is non-diversified.