The waterproof, smudge-resistant, and fade-resistant features of these cartridges are great for printers such as: WF 3620, WF 3640, WF 7110, WF 7210, WF 7610, WF 7620, WF 7710, WF 7720. These standard-capacity pigment-based ink cartridges. They hold up well on paper and don't soak, so they work well for sharper, brighter prints. Replace the cartridge that has run out and does not work with a new one. You will feel relief when printing documents or photos. These cartridges are great for both plain (matte) and glossy photo paper. This is a very smart purchase, as you will save your money and the cartridges will serve you for a long period of time.Ultra Ink is a revolutionary ink that delivers consistent color without side effects on all papers.