123inkjets offers the best alternative to the OEM (genuine) Hewlett Packard C9733A (HP 645A) magenta laser toner cartridge. Remanufactured with mostly new parts, our HP 645A cartridges are refurbished to perfection for crisp, clear prints, every time. Our C9733A replacement includes a new electronic 'smart chip' that allows your HP printer and the cartridge to interact and track toner usage. Laser toner you can rely on at a price you can afford. Our replacement laser toner cartridges are not remanufactured by HP.