E250, E35X 3.5K Return Program Toner Cartridge E250A11E 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 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. For use with Lexmark E250d, E250dn, E350d, E350dn, E352dn printers.