For HP LaserJet Enterprise 600 M601dn, 600 M601m, 600 M601n, 600 M602dn, 600 M602m, 600 M602n, 600 M602x, 600 M603dn, 600 M603n, 600 M603xh, M4555 MFP, M4555f MFP, M4555fskm MFP, M4555h MFP. Yields up to 10,000 pages. Black.