The Xerox Phaser 3120 laser printer uses the OEM Xerox laser toner cartridges and supplies. Our compatible toners for Xerox Phaser 3120 are manufactured to meet the same original specifications and performance standards as the Xerox OEM laser toner cartridges. We offer a 100% Quality Satisfaction Guarantee on alternative laser toner cartridges and supplies for use in the Xerox Phaser 3120.