SPECIFICATION: Genuine Xerox Part: 106R01535; Page Yield: 30,000 RELIABLE: Compatible toners may risk breakdown, poor colors and reduced page yields. Print with Genuine Xerox Toners for spot-on results, vibrant colors and sharp edges OPTIMAL: Original Xerox cartridges made by Xerox for Phaser 4600/4620 printers and work straight out of the box. Your printer reads the chip, you press 'Start' and it starts working