Set of 4 Compatible Brother ink cartridges (1 x LC139XL Black + 1 x LC135XL Cyan/Magenta/Yellow) FOR USE WITH THESE PRINTERS ONLY: BROTHER MFCJ6520DW, BROTHER MFCJ6720DW, BROTHER MFCJ6920DW Yield: Up to 2400 Pages (58ml) LC139XL BK Yield: Up to 1200 Pages...