HP Colour Laser Jet Smart Print Black Cartridge - Q3960A. For use in HP Colour Laser Jet 2550 series Printers. Page Yield - up to 5,000 pages.Compatible Printers: HP Color LaserJet 2550 LN, HP Color LaserJet 2820 AIO, HP Color LaserJet 2550 L, HP Color LaserJet 2840 AIO, HP Color LaserJet 2550, HP Color LaserJet 2820, HP Color LaserJet 2840, HP Color LaserJet 2550 N, HP Color LaserJet 2550 Series, HP Color LaserJet 2800 Series