The Top Ink X-C6510 Toner Printer Ink 6510 Cartridge is a high-quality, sealed in box black toner cartridge designed for use with Xerox Phaser 6510 printers. It is compatible with the Xerox brand and utilizes laser print technology for crisp and clear printing. This unit quantity of 1 cartridge is ideal for those looking for a reliable and efficient printing solution.