The Lexmark T420 print cartridges are specifically designed to assure optimal print quality, with crisp, dark output from first print to last. Lexmark T420 print cartridges work only with T420 printers and are not compatible with any other Lexmark printers. Cartridges designed for other Lexmark products will not work with T420. Average Cartridge Yield 5,000 standard pages. Declared yield value in accordance with ISO/IEC 19752. Prebate?supplies are now called Lexmark Return Program cartridges. Details of the license program remain the same. Only the name has changed. For a period of time, when you order a Return Program cartridge, you may receive a Prebate?cartridge. We appreciate your patience during this transition. 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.