Compatible HP C9721A 641A Cyan. For the following machines: Color LaserJet 4600, Color LaserJet 4600dn, Color LaserJet 4600dtn, Color LaserJet 4600hdn, Color LaserJet 4600n, Color LaserJet 4650, Color LaserJet 4650dn, Color LaserJet 4650dtn, Color LaserJet 4650hdn, Color LaserJet 4650n. With a yield of 8000 pages