Speedy Inks - Compatible Replacement for HP 42A Q5942A Black Laser Toner For use in: LaserJet 4240, 4240N, 4250, 4250DTN, 4250DTNSL, 4250N, 4250TN, 4350, 4350DTN, 4350DTNSL, 4350N, 4350TN Page Yield: 10000* | Color: Black | *Average printer cartridge page yield in accordance with ISO 19752 Shelf Life: 24-36 Months The use of aftermarket replacement cartridges and supplies does not void your printer's warranty