greencycle 1 PK Compatible Q5942X 42X Black Toner Cartridge for HP Laserjet 4250 4350 4350tn Full 1 year warranty against manufacturer defects and print quality. Compatible new toner cartridge and drun unit unconditionally guaranteed to provide same performance and reliability as genuine HP cartridge. Yield: Black Toner Cartridge up to 20,000 pages at 5% coverage (Letter size Paper) Actual toner yield varies with usage, graphics printed and environmental conditions. Compatible HP Printer below:LaserJet 4250, LaserJet 4250dtn, LaserJet 4250dtnsl, LaserJet 4250n, LaserJet 4250tn, LaserJet 4350, LaserJet 4350dtn, LaserJet 4350dtnsl, LaserJet 4350n, LaserJet 4350tn