For long-lasting, high-quality image output with your Phaser laser printer, choose a genuine Xerox black toner cartridge (106R01533). When you see Toner Low or Toner Empty error messages on your Phaser 4600 or 4620, it's time to switch in a fresh toner cartridge. Keep a new one to hand for easy Compatible when necessary. This cartridge ensures reliable and extended operation with your Xerox printer, yielding up to 13,000 pages.