1.CISS-4,CISS-5,CISS-6 2.Outer Box Color:White and Gray(please see the attached picture) 3.Six tanks can make CISS-5 4.All-around sealed protection can prevent inks from transformation because of sunshine 5.Cover design can prevent dusts from coming into ink sprue,and can't take dust into cartridge when you refill ink secondly 6.Its design is perfect and it is a better solution for ink leaking problem 7.Double protection can prevent CISS from stricking when delivery