The HP Toner Drum HP 32A (also known as HP CF232A) is the imaging drum unit for select HP LaserJet Pro printers that transfers toner from the cartridge onto paper to create crisp, high-quality text and graphics; it’s a key replaceable part with a yield of about 23,000 pages and is designed to keep print output sharp and consistent in LaserJet Pro M203 and M227 series models.