Compatible for HP 27 & 28 Combo Black Color (C8727A and C8728A) for DeskJet 3320, 3325, 3420, 3425, 3450, 3520, 3520V, 3550, 3650, 3650V, 3700 series, 3740, 3745, 3840, 3845, 3845XI one year guarantee Page Yield: Black 280 Color 240 pages