The HP Color LaserJet 2550n uses compatible 122A toner in black, cyan, magenta and yellow. Black is Q3960A at about 5,000 pages. Cyan (Q3961A), magenta (Q3963A) and yellow (Q3962A) each yield about 4,000 pages. A compatible Q3964A drum lasts about 20,000 pages. Same supplies also fit the Color LaserJet 2550 Ln, Color LaserJet 2550L and Color LaserJet 2820. 100% satisfaction guarantee.
