The dual pack LaserJet 49X Black Toner Cartridge by HP/Hewlett-Packard keeps your tones consistent when printing large quantities. Smart printing technology provides dependable, uniform results during the entire life of the cartridge. SureSupply technology alerts you when the toner is running low. Keep your prints sharp and consistent, even at high volumes. For HP LaserJet 1320 & 3390 Printers.