Return Program toner cartridge is designed for use with Lexmark X651DE, X652DE, X654DE, X656DE, X656DTE, X658DE, X658DFE, X658DME, X658DTE, X658DTFE & X658DTME. Lexmark Return Program Cartridges are sold at a discount, vs. the prices of regular cartridges, in exchange for the customer's agreement to use the cartridge only once & return it only to Lexmark for remanufacturing or recycling.