ND Brand Dinsink 3x30ml HP 940 940XL water-based pigment ink refill for HP Officejet Pro 8500A, HP 8500, and HP 8000 printers ND Brand 3x30ml premium water-based UV resistant pigment ink; Particles: &lt;0.5 micron (Average&lt;100 nanometer); Stability: No settling in 2 years (at normal storage); Temperature: -12C no frozen and 50C no gelling; This ink is compatible with HP 940 940XL ink cartridge.