INKUTEN LC203 LC205 LC207 Extra-Large Refillable Ink Cartridges with Auto Reset Chips for Brother MFC-4320DW MFC-J4420DW MFC-J4620DW MFC-J485DW MFC-J5520DW MFC-J5620W MFC-J5720DW Printer These elongated refillable cartridges can hold 70ml of ink each, for around 3500 pages between refills (at 5% coverage). Refilling is easy thanks to the easy-to-remove plugs. Just remove the plug, inject ink, and put the plug back in. Since the cartridges are bigger than the originals, the door will have to detached. This is easy to do and in no way damages the door. A door clip is included which will depress the printer's door sensor, allowing you to print. Product contents: set of 4 elongated refillable BROTHER LC203/LC207/LC205 cartridges, 4 dust filters, 1 door clip, detailed instruction sheet covering the whole process from start to finish. The cartridge is transparent. It is easy to view how much ink left to prevent from lack of ink to cause air bubbles or how much ink filled in to avoid overfill for easy operation. This cartridge can be easily refilled and reused again and again.