Box open but sealed cartridges. The 4PK Premium Toner Cartridge set is designed for use with HP Color LaserJet Pro printers, such as the 3301sdw model. This high-yield toner set includes cyan, yellow, magenta, and black cartridges, each with a page yield of 1,200-1,300 pages. The cartridges are compatible with various HP printer models and are equipped with chips for easy monitoring of ink levels. Manufactured in the United States, this toner set ensures quality prints and reliable performance for your printing needs.