the tn321bk is a black print cartridgee for the brother dcp-l8400, dcp-l8450, hl-l8250, hl-l8350, mfc-l8650, mfc-l8850, mfc-l8850, and mfc-l8850 laser printers. of course there is high printing reliability and above all high quality and economical printing. for this black toner, up to 2500 pages at 5% coverage.
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