State Street SPDR Nuveen ICE Municipal Bond 

The fund invests substantially all, but atleast 80%, of its total assets in the securities comprising the index and in securities that the adviser determines have economic characteristics that are substantially identical to the economic characteristics of the securities that comprise the index. The index is designed to track the performance of U.S. dollar denominated investment grade tax-exempt debt publicly issued by U.S. states and territories, and their political subdivisions, in the U.S. domestic market.