Always running out of black ink before the colours are finished? If this story sounds familiar then the HP No. 56 black twin pack may be just what you need. These ink cartridges fit in some of HP’s most popular home and small office printers such including some DeskJet and PhotoSmart models. When you order the HP. No 56 black ink twin pack we’ll send it out in our easy to recycle, cardboard envelopes that will fit right through the letterbox. Better yet, standard delivery is included at no extra cost.