Produce the best possible results with your HP printer by using a genuine HP toner cartridge. Compatible with the HP LaserJet Enterprise M4555 and 600 series, the 390X cartridge will produce professionally stunning black and white prints with sharp, accurate lines and text guaranteed. The high capacity cartridge is easy to install and replace, and will last for up to 24,000 printed pages before needing replacement. Please note that this item is compatible only with the Enterprise M4555 series and Enterprise 600 M602/M603 (not M601).