Lexmark Return Program Cartridges are sold at a discount versus the prices of regular cartridges in exchange for the customer’s agreement to use the cartridge only once and return it only to Lexmark for remanufacturing or recycling. Regular cartridges without this license/agreement sold at regular prices are also available. Regular cartridges are also recyclable at no cost through Lexmark Cartridge Collection Program. 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 32,000 standard pages. Declared yield value in accordance with ISO/IEC 19752.