... .Environmental protection :No need to buy new cartridges anymore,no waste of a single drop of ink,more perfect and scientific solution.3 ... cost a lot,comparing with using OEM cartridges.4.Convenience :No need to replace ink cartridges,just need to refill inks.After set ... .5.Advantage:No damage to printer;No need to replace ink cartridge.6.Stability:Injection molding,better stability,no shape change ...