FREE Full Pre-filled Refillable HP 88 (Black XL) and 88 (color) Ink Cartridges for HP Officejet K550...etc + "4" of 200ml Bottles Specially-Formulated Printer INK (equivalent to 28 ink cartridges, $428 Value) Save Cost: Save 70-90% cost compare with the cost on OEM products. Auto Reset Chips: automatically reset, which makes the cartridges, can be used over and over again. The ink volume is larger than OEM's. The ISO printing test pages more than OEM's. It is enviromental friendly green inkjet product - Save our earth with a much less cost. We provide the professional Internet technical support 24 hours/day and 365 days/year.