Our Xerox Compatible Toner Cartridges for your Xerox WorkCentre 421PI are designed to meet, or exceed your expectations of the Genuine Xerox, name-brand, product at a fraction of the price. The Xerox WorkCentre 421pi Compatible Toner Cartridges are designed to give you optimal print quality, for bold, professional looking documents and projects. This Workgroup printer is ideal for educational offices, corporate teams, and everything in between, being able to handle all your business needs, including scanning, copying, and faxing. We carry the Compatible Xerox 106R647 Toner Cartridges, as well as the Genuine Xerox 113R629 Drum Units. Every Compatible and Genuine Xerox Toner cartridge and drum unit for your Xerox WorkCentre 421 PI has up to a 2 Year Shelf life and is backed with the Inkgrabber 90 Day Money Back Guarantee.