This genuine OKI 43381721 drum unit has been expertly designed as the most effective way of handling the yellow toner powder that comes from its corresponding toner cartridge. As such you can expect the best possible results when using the original OKI 43381721with remanufactured or original toner cartridges.The precision employed by OKI when manufacturing the 43381721 imaging drum unit is plain to see when handling or using it, and we are confident that you will love the results. With a estimated 20,000 page yield this OKI 43381721 yellow imaging drum unit does not need to be changed often, further reducing the cost per page.