All of our cartridges are remanufactured from genuine cartridge parts. Many of our competitors import and sell cartridges from third party manufacturers who use cheaper quality materials and parts. Those cartridges tend to break easily and the toner leaks out of the cartridge, which is bad for your health as well as your printing machines. Our superior cartridges will not break or leak. In addition, our cartridges have brand new drums in them, so your printing quality will be equivalent to that of a brand new cartridge.