InkOwl - Empty Extra-Large Refillable Cartridges for BROTHER MFC-J4310DW, MFC-J4410DW, MFC-J4510DW, MFC-J4610DW, MFC-J4710DW (70ml capacity) 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. IMPORTANT NOTE: Original BROTHER cartridges have chips on them to indicate the ink level to printer. Since aftermarket auto-reset chips are not yet available, you'll have to transfer the chips from your original cartridges to the refillables. This is very easy to do, and demonstrated step by step in the included instruction manual. Note that using original chips means the ink levels will not be accurate. This is not a problem because the cartridges are transparent so you can always see how much ink you have left inside. The printer will never stop you from printing even when the cartridge chips read "empty", though you may receive error messages. If you would like your printer to display full ink levels and avoid any error messages, see our "Chip Resetter for BROTHER LC103, LC105, LC107", sold separately. Product contents: set of 4 elongated refillable BROTHER LC103/105/107 cartridges, 4 dust filters, 1 door clip, detailed instruction sheet covering the whole process from start to finish.