Lexmark X644e and X646e MFP supplies are designed for the highest quality output. The supplies are designed for easy customer installation and quality performance, from the first page to the last. Lexmark X644e and X646e MFP supplies are not compatible with other Lexmark MFPs or printers. Average Cartridge Yield 10,000 standard pages. Declared yield value in accordance with ISO/IEC 19752.