INKUTEN Brother LC51 Refillable Ink Cartridges CISS and 4 Bottles of 100ml Dye Ink Refill Kit There are easy-refill hole and rubber plug on the top of each cartridge. It is very easy to remove the plug for ink refill and replace it back after refilled for the easy refilling. Brother LC51: DCP-130C, DCP-330C, DCP-350C, Intellifax 1360, Intellifax 1860C, Intellifax 1960c, Intellifax 2480C, Intellifax 2580c, MFC-230C, MFC-240C, MFC-3360C, MFC-440CN, MFC-465cn, MFC-5460CN, MFC-5860CN, MFC-665CW, MFC-685cw, MFC-845CW, MFC-885cw 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. Easy-refill - Does not require syringes to refill when used with our refill ink bottles The prefilled ink cartridges can be used as regular ink cartridges for an easy using.