BFZ is a municipal bond mutual fund offered by Blackrock, one of the largest investment management companies in the world. This fund focuses on investing in municipal bonds issued by the state of California, providing investors with tax-free income. With a diverse portfolio of high-quality bonds, BFZ aims to provide a steady stream of income while also preserving capital for its investors. As a closed-end fund, BFZ has a fixed number of shares and may trade at a premium or discount to its net asset value. Overall, BFZ offers a low-risk investment option for those seeking tax-free income from California municipal bonds.