HP 70 Matte Black and Cyan Printheads to fit Designjet Z2100 / Photosmart Pro B9180. OEM Ref - C9404A. This printhead is one of six used by your printer. It takes ink from the matte black/cyan cartridges, using a jet action to transfer colour to the page. When used with genuine HP ink cartridges it ensures consistent quality results even when low on ink. HP printheads are designed for durability, so you only need to replace them when notified by your printer.