ND R@ 5X10OZ Pigment Refill ink kit for 940 940XL: Pro 8000, Pro 8500, Pro 8500A...The item with ND Logo! High quality refill pigment ink Particles: &lt;0.5 micron (Average&lt;100 nanometer); Stability: No settling in 2 years (at normal storage); Lightfastness: 7-8 BWS; Rubfastness: 5 (Excellent); Waterfastness: 5 (Excellent); Gasfastness: 5 (Excellent).