What ink cartridge does hpsmarttank5 18 use?

HP8 18(CC640ZZ). according to HP official website, hpsmarttank5 18 uses HP8 18(CC640ZZ) ink cartridge. HP8 18(CC640ZZ) is to reform the inside of the ink cartridge, take out the sponge inside the ink cartridge, expand the internal capacity of the ink cartridge, so as to increase the printing volume of the ink cartridge, and then replace the original ink cartridge cover with a professionally designed (patented) air pressure balancing device for the ink cartridge cover, so as to stabilize the air pressure and ensure the smooth printing of the ink cartridge.