This is a compatible replacement for the Xerox 016-1604-00 black Solid Ink ColorStix cartridge, designed for use with Xerox Phaser 840 printers. The cartridges deliver brilliant, professional color output, ensuring consistent and vibrant prints on virtually any media. Priced approximately 30-40% less than the original Xerox cartridges, these alternatives provide an economical option without compromising on quality. Backed by a 100% Quality Satisfaction Guarantee, you can rely on these cartridges for your printing needs.