These printers use the LC506XL Cyan cartridge:
Brother INKvestment MFC-J 4355 DW
Brother INKvestment MFC-J 4555 DW
Brother INKvestment MFC-J 5010 DW
Brother INKvestment MFC-J 5110 DW
Brother INKvestment MFC-J 5115 DW
Brother INKvestment MFC-J 6560 DW
Brother INKvestment MFC-J 6960 DW
Brother INKvestment MFC-J 6975 DW