The fund seeks to track the investment results of the index which is a market-value-weighted index that seeks to measure the performance of investment-grade (as determined by S&P Dow Jones Indices LLC, tax-exempt, U.S. municipal bonds, reducing callable bonds before 2030, and only including non-callable bonds maturing in 2030. The fund will invest at least 80% of its assets in the component securities of the underlying index. The fund is non-diversified.