The investment seeks to track the investment results of the BlackRock Investment Grade Enhanced Bond Index. The fund will invest at least 80% of its assets in the component securities of the underlying index and may invest up to 20% of its assets in certain index futures, options, options on index futures, swap contracts or other derivatives, as related to its underlying index, cash and cash equivalents, other investment companies, as well as in securities and other instruments not included in the underlying index. The index consists of U.S. dollar-denominated, investment-grade corporate bonds.