Profile: CIS Inks offers continuous ink system (CIS), refillable cartridges and high quality bulk refill ink for ink jet printers. Our refillable ink cartridge is compatible for inkjet printers. Sponge cartridges are pre-filled with dye ink with auto reset chips. Our cartridge is an UV resistant pre-filled system. These cartridges work exactly same as the OEM ink cartridges but when they run out of ink, just refill and re-use them.