E250, E350, E352 Toner Cartridge...Lexmark supplies are designed for the highest quality output, page after page. Average Cartridge Yield 3,500 standard pages. Declared yield value in accordance with ISO/IEC 19752. 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.