Genuine OEM HP PageWide Enterprise Color 556 xh Ink and Supplies
Not every supply for the PageWide Enterprise 556xh is an ink cartridge. HP's B5L09A ink-collection unit is a separate maintenance part, not a source of printing ink. Keep that distinction in mind when choosing between a collection unit and HP 981A, 981X, or 981Y cartridges.
Toner Buzz carries genuine HP ink as singles and four-color sets, along with the B5L09A unit. The ink choices run from standard to high to extra-high yield, so you can match capacity to your printing volume.