Make the most of your Lexmark printer with this original toner cartridge. The UnisonT Toner formulation delivers consistent quality and ensures reliability with the shake free system. Keep costs low and quality high with Genuine Lexmark cartridges. The Lexmark Return Programme cartridges are patented print cartridges sold at a discount to be used only once and returned to Lexmark for remanufacturing or recycling. These patented cartridges are licensed for single use only and will stop working after delivering a fixed amount of toner. This extra high capacity black toner cartridge is capable of printing up to 20000 pages.