The HP 49X is a mono (black) toner cartridge that is compatible with many popular Hewlett Packard laser printers including the HP LaserJet 3390. With a yield of 6,000 pages this Q5949X cartridge will last the average user for a long time.As a brand new original Hewlett Packard product you can expect premium print quality from the Q5949X. All components have been manufactured by HP to unbeatable quality meaning there is no better option for your printer than the HP 49X toner cartridge.