HP twin pack No 21 and No 22. The HP 22 Tri-colour Inkjet Print Cartridge produces brilliant, long-lasting photo-quality output using patented dye-based inks formulated to work precisely with your HP printing system for outstanding results every time. The HP 21 Black Inkjet Print Cartridge with HP pigment-based inks prints professional-looking documents with laser-quality black text. Get results you can count on across a broad range of plain papers and speciality media. Black and Tri-colour (Cyan, Magenta & Yellow).