This Printronic ink cartridge set contains both black 56 and tri-color 57 cartridges, compatible with HP printers. The cartridges are sealed and refilled, ensuring cost-effective and reliable printing for your home or business needs. The brand, Printronic, is known for producing high-quality ink cartridges that produce sharp and vibrant prints. These cartridges are perfect for those who want to save money without sacrificing print quality. The cartridges come in tri-color, black, and both colors for your convenience.