brother genuine cartridge - brother tn-221bk is a brother genuine cartridge that produces black prints in high quality you can depend on. yields up to 2,500 pages -this replacement standard-yield black toner cartridge can print approximately 2,500 pages(1). seamless integration - this professional replacement black toner cartridge creates rich blacks and is engineered to work in seamless unison with your brother printer. for use with brother printers and all-in-ones - hl-3140cw, hl-3170cdw, hl-3180cdw, mfc-9130cw, mfc-9330cdw, mfc-9340cdw. footnotes: (1)approx. Toner cartridge yields in accordance with iso/iec 19798 (letter/a4) standards.