Toner/print cartridge is designed for use with Lexmark C770 and C772 Series. Easy front-loading design includes a simple, intuitive user interface. Cartridges yield up to 6,000 pages based on approximately 5 percent 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.