Toner cartridges come in 2 types. Some printers have cartridges that are made of 2 sections, one that houses the toner and the drum as well as the waste hopper. Other printers accept a separate toner cartridge, and a separate drum cartridge. The latter are usually color cartridges, except for Brother laser printers which almost always take type 2 (separate toner cartridge, and separate drum cartridge. Example the TN350 toner cartridge by Brother is separate the the DR350 drum cartridge).