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Each cartridge individually print tested at manufacturing stage.. For Panasonic Printers - KX-MB1900, KX-MB2000, KX-MB2008, KX-MB2038, KX-MB2003, KX-MB2033, KX-MB2000, KX-MB2010, KX-MB2025, KX-MB2030. Colour - Black. Yield - Up to 2,000 pages.