Epson 502 EcoTank Ink Ultra-high Capacity Bottle Color Combo Pack Works with ET-2750, ET-2850, ET-2980, ET-2988, ET-3750, ET-3760, ET-3850, ET-4850, and other select EcoTank models

actually, I haven't used them yet. the printer is 4.5 years old and I've used about 1/3 of the original ink. I've had other printers and if you didn't print regularly the cartridges would dry up or get clogged. as you can see, i have hardly used this printer and the ink is still good and i still have more in the original bottles. You can buy much less expensive printers and pay a fortune for ink that can dry up if you don't print, but then you have the hassle of running out and ordering more and wait for it to come, or drive to the store to pick it up. The ink isn't messy at all and it's simple to refill the cartridges. You absolutely don't need to purchase cartridges that have black and all of the colors because you fill them each independently.