This Hewlett-Packard HP Invent 56/57/57 Combo Pack Printer Ink Cartridges is a great choice for those in need of high-quality ink cartridges. The cartridges are compatible with HP printers and come in a variety of colors, including tri-color and black. The expiration date for these cartridges is December 2007.This combo pack is perfect for those in need of ink cartridges for their HP printer. The cartridges come in a convenient pack and are easy to install. With this product, you can ensure that your printing needs are met with ease.