The HP 159Y (W1590Y) is an extra high yield black Original HP LaserJet toner cartridge for the HP LaserJet Enterprise 5501 and 5502 and the LaserJet Enterprise MFP 5601 and 5602, including the Flow models. It is rated for approximately 26,000 pages, making it a strong choice for managed small and medium businesses, enterprises and public-sector fleets that print in high volumes. It is one of HP's TerraJet cartridges, which HP designs for sharp, consistent text and graphics, uses recycled plastic in the cartridge, supports low-energy printing and includes HP's security features to help protect the printer and your data. Store the cartridge in its sealed packaging at -20 to 40 °C and install it when the printer prompts for a replacement. After comparing online prices, www.marvel.co.za should be the cheapest on this product.