The T. Rowe Price Summit Municipal Income Fund - I Class (PRIMX) is a mutual fund that focuses on investing in municipal bonds. This fund is managed by T. Rowe Price, a well-respected investment management firm. The "I Class" designation indicates that this fund is only available to institutional investors, such as pension funds and endowments. The fund aims to provide investors with a steady stream of tax-free income by investing in high-quality municipal bonds issued by state and local governments. This fund may be a suitable option for investors seeking tax-efficient income and a lower level of risk compared to other types of investments.