Lexmark Original C2320K0 Black Return Programme Toner Cartridge (1,000 pages). This toner cartridge is compatible with Lexmark C2325DW printers and other Lexmark models. The Lexmark Return Programme cartridges are patented print cartridges sold at a discount in exchange for the customer's agreement to the licence requirement that the cartridges will be used only once and returned only 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 ink and/or toner. Ink and/or toner may remain in the cartridge when replacement is required. Replacement cartridges sold without these restrictions are also available. Toner-kit black return program 1K pages ISO/IEC 19752 for Lexmark C 2325/2425/2535.