The MainStay MacKay Tax Free Bond Fund, Class B (MKTBX) is a mutual fund that primarily invests in tax-exempt bonds issued by state and local governments. This fund aims to provide investors with a steady stream of tax-free income while also preserving capital. It is managed by MainStay Investments and MacKay Shields, two well-respected investment firms. The Class B shares of this fund may have a lower initial investment requirement compared to other classes, making it accessible to a wider range of investors. Overall, MKTBX is a suitable option for those seeking tax-free income and a conservative investment approach.