The product is a genuine Lexmark 36 37 2PK ink cartridges set designed for use in Lexmark printers. These black cartridges are compatible with various Lexmark X Series and Z Series models, including the X3650, X4650, and Z2420. The ink cartridges feature a print technology suitable for inkjet printers, providing high-quality printing results in colors such as cyan, yellow, magenta, and black. With this genuine Lexmark product, users can expect reliable performance and consistent print quality for their Lexmark printers.