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Each cartridge individually print tested at manufacturing stage. Deskjet 3720 : Deskjet 3721 : Deskjet 3723 : Deskjet 3724 : Deskjet 3730 : Deskjet 3732 : Deskjet 3733 : Deskjet 3752 : Deskjet 3755 : Deskjet 3758. Colour - Black. Up To 1440 Pages.