Premium Quality C540H1KG Black Toner compatible with the Lexmark C540, C540N, C543, C543DN, C544, C544DN, C544DTN, C544DW, C544N, C546, C546DTN, X543, X543DN, X544DN, X544DTN, X544DW, X544N, X546, X546DTN, X548, X548DE, X548DTE . The use of compatible supplies does not void your printer warranty. Product Detail Ninestartechonline.com