HOTCOLOR 100ml Dye Ink Refill Kit for 934 935 934XL 935XL : OfficeJet Pro 6230 Pro 6830 OfficeJet 6812 6815 Printers (4x100ML) Match or Exceed OEM specification on color, pH, surface tension and viscosity Stability: No settling in 3 years (at normal storage); Temperature: -15? no frozen, 70? no gelling; 99% similar as oriignal, researched unique ink, not universal. For use in 934/935 934XL/935XL Inkjet Cartridge Compatible for printers of Ink Cartridge: Officejet 6812 e-All-in-One Printer, Officejet 6815 e-All-in-One Printer, Officejet Pro 6230 ePrinterOfficejet Pro 6830 e-All-in-One Printer, Officejet Pro 6835 e-All-in-One Printer Packing List: 1*100ML Black Ink;1*100ML Cyan Ink;1*100ML Magenta Ink;1*100ML Yellow Refill ink + Thumb Drill + refill instruction + 4 syringes