The investment seeks to replicate as closely as possible, before fees and expenses, the price and yield performance of the Barclays Municipal Custom High Yield Composite Index (the "High Yield Index"). The fund normally invests at least 80% of its total assets in securities that comprise the benchmark index. The High Yield Index is comprised of publicly traded municipal bonds that cover the U.S. dollar denominated high yield long-term tax-exempt bond market. The fund is non-diversified.