The Original Black HP 45A (Q5945A) Toner Cartridge will produce long lasting, laser sharp prints for the life of the Cartridge. The Genuine Q5945A Toner Cartridge comes with a built in Imaging Drum Unit ensuring Superior Quality results each time the cartridge is replaced. Meaning less common printing problems and increased work flow.The Original HP 45A Black HP toner Cartridge boasts and impressive page yield of 18,000 (based on a 5% coverage) making this product ideal for the home or small office environment. The Q5945A is designed to be used with Hewlett Packards Laserjet 4345 Printer and comes with our 100% satisfaction guarantee.