The T812 Standard Capacity Combo Pack with Sensormatic from Epson provides you with four standard capacity ink cartridges for cyan, magenta, yellow, and black, and they are compatible with the WorkForce Pro WF-7820 and WorkForce Pro WF-7840 Printers. The black cartridge is rated to yield approximately 350 pages, and the cyan, magenta, and yellow cartridges are rated to yield approximately 300 pages. Additionally, these cartridges feature DURABrite Ultra instant-dry pigment ink for professional-quality prints.