Refillable (refill friendly) ink cartridges are designed to be refilled a number of times and feature a unique Auto Reset Chip (ARC). In many printers, "empty" ink cartridges simply stop functioning with an "out of ink" error message. Refillable ink cartridges overcome this problem and they are designed to be easily refilled by just removing a small plug and inserting the ink. Note : All refillable cartridges are supplied empty.