16oz Black & 3x4oz Color (C M Y) Nano premium pigment ink refill kit for HP 940 940 XL officejet pro 8000 8500 printers cartridges CISS+4 syringes 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; Lightfastness: 7-8 BWS; Rubfastness: 5 (Excellent); Waterfastness: 5 (Excellent); Gasfastness: 5 (Excellent).