Genuine OEM HP Deskjet 1120cse Ink and Supplies
The 1120cse's HP 45 black twin pack doesn't include color ink. It holds two black cartridges, while the HP 45/23 combo groups one black cartridge with one tri-color cartridge for a combined ink purchase.
Toner Buzz carries genuine HP 45 black and HP 23 tri-color singles, plus the black twin pack and mixed combo. Choose the twin to keep a spare black cartridge or the combo when you need black and color together.