The fund is an actively managed ETF and thus does not seek to replicate the performance of a specific index. Instead, it uses an active management strategy to meet its investment objective. The fund, under normal circumstances, invests at least 80% of its assets (net assets plus borrowings for investment purposes) in: (i) debt securities whose interest is, in the opinion of bond counsel for the issuer at the time of issuance, exempt from federal Income tax ("Municipal Bonds"); and (ii) debt securities covered by an insurance policy guaranteeing the payment of principal and interest.