This is a Compatible MONOCHROMATIC TONER XEROX brand Toner Cartridge (HI BLACK TONER) that works with the following printers / machines (LASERJET 4000, LASERJET 4000N, LASERJET 4000TN, LASERJET 4050, LASERJET 4050N, LASERJET 4050TN). Product Features: Compatible with: LaserJet 4000, 4000n, 4000se, 4000t, 4000tn, 4050, 4050n, 4050se, 4050t, 4050tn Duty Cycle: Up to 10000 pages at 5% coverage Printing Color: Black Printing Technology: Laser Product Description: Xerox LaserJet 4000 - black - toner cartridge (alternative for: 27X) Product Type: Toner cartridge Benefits of this product: With Xerox 006R00926 you'll be able to save money, print more and there's no worry! Enjoy up to 30% savings over OEM cartridges. Take a look - Xerox cartridge yields are up to 10% higher than . HIGH YIELD BLACK TONER. LASERJET 4000, LASERJET 4000N, LASERJET 4000TN, LASERJET 4050, LASERJET 4050N, LASERJET 4050TN. Compatible XEROX Brand.