Gigablock CIS 5 Colors Refill Ink Set for CISS of Epson Expression XP-600 800 Cartridge T273020 T273220 T273320 T273420 T273120 CIS Refill Kit with 5 Colors UV(Ultra Violet) Resistant Ink for Epson Expression XP-600 XP-800 Continuous Ink System (Related Cartridge # : T273020 T273220 T273320 T273420 T273120) 120ml Each (Pigment Black, Photo Black, Cyan, Magenta, Yellow) Equivalent to 8 ~ 9 cartridges per color; Thats a total of about 40 ~ 45 cartridge yields all in this 1 refill kit Perfect buy for high volume printers, this represents over 200% savings compared to buying new OEM cartridges The ink in this refill kit is UV(Ultra Violet) resistant Dye based and matches the OEM quality in both quality and page yield