These printers use the CE261X cartridge:
Click On a Printer to View it's Cartridges
          HP Color LaserJet CP-4025
          HP Color LaserJet CP-4025 DN
          HP Color LaserJet CP4025DN Printer
          HP Color LaserJet CP-4025 N
          HP Color LaserJet CP4025N Printer
          HP Color LaserJet CP-4520
          HP Color LaserJet CP-4525
          HP Color LaserJet CP-4525 DN
          HP Color LaserJet CP4525DN Printer
          HP Color LaserJet CP-4525 N
          HP Color LaserJet CP4525N Printer
          HP Color LaserJet CP-4525 XH
          HP Color LaserJet CP4525XH Printer
          HP Color LaserJet Enterprise CP-4025 DN
          HP Color LaserJet Enterprise CP-4025 N
          HP Color LaserJet Enterprise CP-4520
          HP Color LaserJet Enterprise CP-4525 DN
          HP Color LaserJet Enterprise CP-4525 N
          HP Color LaserJet Enterprise CP-4525 XH