Inclusions: Toner Cartridge Replacement Compatible with HP 49X Q5949X High Yield Black 5-Pack Compatible with: Printer LaserJet: 1320, 1320n, 1320nw, 1320t, 1320tn, 3390 and 3436 Page Yield: 6,000* Shelf Life: 24-36 Months *Average cartridge page yield in accordance with ISO IEC 24711 Color: Black The use of aftermarket replacement cartridges and supplies does not void your printer's warranty