AZ Supplies Re-Manufactured Replacement Toner Cartridges for HP 2550 Toner Cartridges 122A 4 Color Set (Black, Cyan, Magenta, Yellow) Q3960A, Q3961A, Q3962A, Q3963A for use in HP Color LaserJet 2550, 2820, 2840, 2550n, 2550LN Series Printers Black:6,000, Color:4,100 page yield Page Yield: Black: 5000, Color: 4000 replace 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 AZ Supplies ( MPSCAL ) 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 AZ 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 AZ 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. The use of AZ Supplies brand replacement laser toner cartridges and supplies does not void printer warranty. Compatible with HP Printers: COLOR LASERJET 2550, COLOR LASERJET 2550L, COLOR LASERJET 2550LN, COLOR LASERJET 2550N, COLOR LASERJET 2800, COLOR LASERJET 2820, COLOR LASERJET 2840,