HOTCOLOR (TM) Refill Pigment Ink 400ml Black Color for Epson XP-100 XP-200 XP-300 XP-400 XP-310 XP-410 WF-2510 WF-2520 WF-2530 WF-2540 Printers 1.Item Includes - 4 Ink Refill bottles (100ml black, 100ml per C.M.Y),total 400ml + Free Syringes 2.The item comes with detail refill instruction. You can refill ink for your original ink cartridge. It is a big saving. 3.Match or Exceed OEM specification on color, pH, surface tension and viscosity 4.Pigment Ink For Epson XP-100 XP-200 XP-300 XP-400 XP-310 XP-410 WF-2510 WF-2520 WF-2530 WF-2540 printers 5.Stability: No settling in 3 years (at normal storage); Temperature: -15? no frozen, 70? no gelling;