Return programme ink cartridge is designed for use with Lexmark X3650, X4650, X5650, X6650, X6775 and Z2420. Nonrefillable cartridge is licensed for single use only. Lexmark Return Programme 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.