Compatible Non-OEM Fountain Pen Ink Cartridges. Replacement for Epson 16/16XL Cartridges. Capacity Comparison T1621/T1631/T1681 Black OEM 5.4ml/12.9ml/21.6ml Compatible 18.2ml (70% more) T1622/T1632 Cyan OEM 3.1ml/6.5ml Compatible 15ml (79% more) T1623/T1633 Magenta OEM 3.1ml/6.5ml Compatible 15ml (79% more) T1624/T1634 Yellow OEM 3.1ml/6.5ml Compatible 15ml (79% more) Please note that if the machine asks for more than one ink to be replaced, please only change one at a time. e.g. If the machine requires Black and Cyan cartridges. Change the black cartridge, let it be registered, and tell you the cyan is still empty, then go ahead and change the next cartridge. Images for illustrative purposes only. The product may differ slightly from the images displayed. This does not mean the product is faulty or will not work. Used In - WorkForce WF-2010W / WF-2510WF / WF-2520NF / WF-2530WF / WF-2540WF / WF-2630WF / WF-2650DWF / WF-2660DWF / WF-2750 / WF-2750DWF |