Return Program ink cartridges are designed for use with the Lexmark Impact S305, Interact S605, Interpret S405, Intuition S505, S604, S815, S816, Pinnacle Pro901, Platinum Pro905, Prestige Pro805, Prevail Pro705 and Prospect Pro205. 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.