Replaces the Following Manufacturer Numbers: HP C8061A (HP 61A), HP C8061X (HP 61X). Compatible with the Following Printer Models: HP LaserJet 4100, HP LaserJet 4100DTN, HP LaserJet 4100MFP, HP LaserJet 4100N, HP LaserJet 4100TN, HP LaserJet 4101MFP.