... guarantee Environmental protection material CISS for Epson workforce Pro WP-4531 printer wp seriesProduct Description:1.This ... install and manipulate, Assembles in minutes and comes with instructions. 3, High quality ink gives excellent printing result4, ... : typeCISS/continuous ink supply systemprinter modelfor Epson workforce Pro WP-4531cartridge No.T6771-T6774 colorK,C,M,YmaterialEnvironmental ...