In addition to the toner cartridges for your Canon IRC-3380, you also require a 0459B002AA and the additional three imaging drum units for the successful running of your printer. The original Canon 0459B002AA imaging drum unit is instrumental in the handling of the yellow toner powder from its corresponding cartridge and you simply cannot run your printer without it.Thankfully this genuine Canon 0459B002AA imaging drum unit has an amazing estimated page yield of 53,000 prints, so they seldom need to be changed and the cost per page is mercifully low too!