LD Compatible Toner Cartridge Replacement for HP 90X CE390X High Yield (Black, 2-Pack) Page Yield: 24,000* per cartridge | Shelf Life: 24-36 months per cartridge | *Average cartridge page yield in accordance with ISO 19752 All LD branded products are backed by a 100% satisfaction and LIFETIME guarantee The use of compatible cartridges and supplies does not void your printers warranty These compatible toners contain new and used parts including brand new wiper blades, OPC drums, an electronic smart chip for accurate toner leveland, and other internal components For use in the following HP LaserJet Enterprise 600 Printers:M602dn, M602n, M602x, M603dn, M603n, M603xh, M4555f, M4555fskm, and M4555h