Most people think of toner cartridges when it comes to printer consumables and overlook equally important parts like this genuine Hewlett Packard CF359A imaging drum unit. Responsible for transferring the cyan toner powder where it needs to be and creating the brilliant prints we have all come to expect from laser printers like the HP Colour LaserJet Enterprise M855dn, the original HP 828A is essential.This genuine Hewlett Packard CF359A imaging drum unit carries an estimated 30,000 page yield and needs replacing just as frequently as the toner cartridges within your printer.