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123inkjets offers the best alternative to the OEM (genuine) Hewlett Packard Q3963A magenta laser toner cartridge for your Color LaserJet 2550 printer series. This cartridge can be used in place of the lower yield Q3973A cartridge. Our Q3963A cartridges are refurbished to perfection for crisp, clear prints, every time. Each of these laser toner cartridges contains not only up to 85% new internal parts (such as OPC drums, wiper blades, and other parts), but also a new electronic 'smart chip' that allows your HP printer and our compatible Q3963A cartridge to interact and track toner usage. Without this chip your printer's toner level software will always think the cartridge is low. Laser toner you can rely on at a price you can afford.