Original black imaging drum units (like the Hewlett Packard CF219A) deliver and distribute toner powder from your toner cartridge wherever it needs to be within your printer. Thankfully Hewlett Packard have made this genuine  HP 19A monochromatic image drum incredibly hard wearing and estimate that it will help you produce 12,000 prints from this single unit.Compatible with several quality black and white laser printers including the HP LaserJet Pro M102w, this original HP 19A is an essential purchase.