Genuine OEM HP Color LaserJet CP4520 Toners
The Color LaserJet CP4520 series uses HP 647A black and HP 648A color toner, with a separate toner collection unit for unused toner. The collection unit does not feed toner into the printer. A warning that it is full is different from a warning that a toner cartridge is low.
Toner Buzz carries genuine HP 647A black and individual 648A cyan, magenta, and yellow cartridges for the CP4520 series. Choose the individual cartridge for the color you need. Toner collection units, fuser kits, and transfer kits are separate maintenance supplies, so match those purchases to the component that needs attention.