ND Brand 4 X 30ml refill Ink kit for Brother LC203 Refillable Ink Cartridges / CISS. for Brother MFC-J4320DW MFC-J4420DW MFC-J4620DW MFC-J5520DW MFC-J5620DW MFC-J5720DW Printer Best for refillable ink cartridges and CISS. You can also use this ink to fill OEM cartridges but you must know how to do that, as we don't provide additional tools and info for refilling OEM cartridges. It is enviromental friendly green inkjet product - Save our earth with a much less cost.