Xerox have been producing some of the finest quality black toner cartridges for many years and this original 106R03624 easily qualifies. Containing sufficient black powder to print an estimated 15,000 prints, this extra high capacity 106R03624 mono laser toner cartridge offers reasonable economy too.Compatible with several monochromatic laser printers (including the Xerox Phaser 3330) that all offer an astounding quality of black and white print, the genuine 106R03624 is a natural choice for those who demand the best.