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Each cartridge individually print tested at manufacturing stage.. HL-L3210CW : HL-L3230CDW : HL-L3270CDW : MFC-L3710CW : MFC-L3730CDN : MFC-L3750CDW : MFC-L3770CDW : DCP-L3510CDW : DCP-L3550CDW : DCP-L3517CDW. Colour - Black. Up to 3000 pages.