Genuine OEM HP PSC 2175 xi Ink and Supplies
The PSC 2175 xi's HP 56 and HP 57 twin packs each contain two cartridges of the same ink type: black or tri-color. For an order covering both black and color, the HP 56/57 combo groups the two ink types together instead.
Toner Buzz carries genuine HP 56 black, HP 57 tri-color and HP 58 photo ink for this printer. Singles let you choose a particular ink, twin packs add a spare of that ink, and the black-and-color combo brings the two everyday ink types into one pack.