CEYE For EPSON Pro3800 Pro3805 Pro 3800 3805 Empty Refillable Ink Cartridge 80ML 9pcs Empty refillable ink cartridge with sensor chips Note:Original chips are required to be used along with the sensor chips and place them under the sensor chips in this compatible cartridges in order to make the chips become the permanent-use chips Thanks to the permanent-use chips, once the system is installed, the chips will never again have to be replaced or reset, so no chip resetter is required Note that the ink levels will freeze where they were once the system was first installed. However, the cartridges are transparent so it easy to see how much ink is really left in each cartridge. The included instruction manual will show you step-by-step exactly how to install the system