Keep Xerox C300, C303, and C305 color printers supplied for black document output with a cartridge rated for up to 6,000 pages. Xerox 006R05091 is the black Return Program print cartridge for these named printer models. It provides the black component required for text, monochrome forms, barcodes, and graphics produced by the supported color-printing devices. The 6,000-page rating makes this cartridge suitable for departments that produce recurring black-heavy documents while retaining a color printer for occasional color output. Replace the black cartridge independently from the color supplies when black density declines or the printer reports that the black supply requires replacement. This helps maintain readable text and consistent dark-image output without replacing supplies that have not reached their own service point. Match the cartridge to the printer model before installation: compatibility is limited to Xerox C300, C303, and C305 printers. The Return Program designation distinguishes this version from other cartridge program configurations, while the black color and 6,000-page yield identify its role within the compatible printer supply set. It is a black print cartridge, not a color cartridge or a combined multi-color supply.