This high quality Canon 4370B002AA toner has been produced using components from genuine Canon cartridges wherever possible. Components that can not be reused are replaced with compatible components designed to deliver comparable results to the original Canon 729BK. With this being a recycled/refilled toner cartridge the black toner powder on the inside is always a high quality compatible alternative to the Canon 4370B002AA toner powder. It has however been deigned by our manufacturers to fuse with unparalleled accuracy as the same temperature as the original powder making it hard to even tell the difference.We are so confident in the remanufactured Canon 729BK black toner cartridges that we supply that each of them comes with a 100% satisfaction guarantee.