Bulk Continuous Ink System (CIS) for: Epson WorkForce 600, 610 and NX515, NX510 (Related Cartridge # : T069120, T069220, T069320, T069420) Related Printer: Epson WorkForce 600, 610 and NX510, NX515 Cartridge Number: T0791 ~ T0796 Pre-filled with 100 ml x 4 colors = 400ml of premium UV(Ultra Violet) Resistant dye based Ink. Permanent Chip with Auto-reset chipsets. 80% Saving on individual Inkjet Cartridge.