This is a single-use chip for the 700ml photo black for use with our refillable cartridges for Epson SureColor T3270/5270/7270.
When the ink level indicated by your refillable cartridge for Epson T3270/5270/7270 reaches empty, you will need to replace the chip on the refillable cartridge. One can easily remove the old chip on the cartridge to install the replacement piece.