Premium Quality Q5942A Black MICR Toner Cartridge compatible with the HP LaserJet 4240n,�4250,�4250dtn,�4250Dtnsl,�4250n,�4250tn,�4350dtn,�4350Dtnsl,�4350n,�4350tn. The use of compatible supplies does not void your printer warranty. Product Detail Ninestartechonline.com