InkOwl Extra-Large Refillable Cartridges for BROTHER LC51 (80-100ml capacity) + 4x120ml ink + syringes The elongated refillable cartridges can hold 80-100ml of ink each, for around 4000 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, they will stick out the printer. A door clip is included which will depress the printer's door sensor, allowing you to print even with the door open. Dust filters are included which, when installed, will prevent dust from entering into the cartridges. This kit contains 4 bottles of 120ml each of Ink Owl's premium ink for Brother printers. This ink will provide a fantastic result on both documents and pictures. It is easy to fill the cartridges up thanks to the included syringes and needles. Product contents: set of 4 elongated refillable BROTHER LC51 cartridges, 4 bottles of 120ml Ink Owl ink for Brother printers, 4 syringes with needles, 4 dust filters, 1 door clip, detailed instruction sheet covering the whole process from start to finish.