These replacement toner cartridges are compatible with the following Lexmark models:
T640, T640 dn, T640 dtn, T640 n, T640 tn, T642, T642 dn, T642 dtn, T642 n, T642 tn, T644, T644 dn, T644 dtn, T644 n, T644 tn
NXT is a premium manufacturer of replacement toners; you will always get OEM quality, better prices, and a lifetime warranty! -- This offer is for (1) premium replacement ink cartridge for the Lexmark T640 also referred to as the Lexmark T644. These are engineered specifically for the above-mentioned Lexmark models.