C522, C524 Black Return Program Toner Cartridge Part#: C5220KS The Lexmark C522, C524 supplies are designed to provide exceptional value, reliability and outstanding print quality. The Lexmark C522, C524 toner cartridges are not compatible with other Lexmark Printers.Yield: Up to 4,000 pages based on approximately 5% coverage. 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.