CS Compatible for HP 2840 Q3960A Black Q3961A Cyan Q3962A Yellow Q3963A Magenta HP 122A COLOR LASERJET 2550 2550L 2550LN 2550N 2800 2820 2830 2840 Toner Cartridges 4 Color Set Page Yield: Black: 6000, Color: 4100 Replaces Q3960A, Q3961A, Q3962A, Q3963A. The Compatible toner cartridge will produce the same amount of page yield as an OEM cartridge would. WARNING: Avoid poor quality knockoffs from other sellers; order directly from Clever Supplies Toner to receive the exact product listed and ensure superior quality. Premium Quality Replacement Toner Cartridge is made by ISO9001 Certified Factory to Meet or Exceed OEM Standards. All Clever Supplies brand products are backed by '100% Quality Satisfaction' 1 year warranty against defects in materials and workmanship for all toner products. Free tech support for any problems for all Clever Supplies brand products. These units are manufactured 100% brand new with all new parts including OPC drums, wiper blades, a smart chip and other internal parts, they are an economical alternative to expensive OEM laser toner cartridges. Compatible with HP Printers: COLOR LASERJET 2550, COLOR LASERJET 2550L, COLOR LASERJET 2550LN, COLOR LASERJET 2550N, COLOR LASERJET 2800, COLOR LASERJET 2820, COLOR LASERJET 2830, COLOR LASERJET 2840