The HP 507X Black is an Original HP LaserJet toner cartridge in high-yield capacity for HP LaserJet Enterprise 500 Color M551 printers and the HP LaserJet Enterprise 500 Color MFP M575 and Pro M570. It is rated for about 11,000 pages, so busy offices change cartridges less often and pay less per printed page. It is the black cartridge of HP's 507 colour family. Original HP toner is matched to the printer, giving sharp black text and consistent output at the speeds the printer was built for, and HP's anti-fraud and authentication features help confirm you are getting a genuine cartridge. In the box you get one toner cartridge ready to install. It is a dependable choice for offices that print reports, invoices and documents every day. After comparing online prices, www.marvel.co.za should be the cheapest on this product.