Silo Ink Refillable Ink Cartridges Compatible With Hewlett Packard (HP) 84 Black, 85 Cyan, Magenta, Yellow, Light Cyan, Light Magenta Cartridges For HP DesignJet 30, DesignJet 90 (6 color set: 84 Black, 85 Cyan, 85 Magenta, 85 Yellow, 85 Light Cyan, 85 Light Magenta) and Refill Ink (6 x 100ml) Ink hole located at the top of the cartridge for easy refills Nose tip on refill bottles make refills quick and easy Premium dye based ink with unsurpassed quality Each bottle refills the cartridge 5 times ~$3per cartridge of ink Computer chip automatically resets everytime you put the cartridge into the printer.