3x30ml Nano Premium Black Pigment Ink Refill Kit for Lexmark #70 Black Ink Cartridges for Lexmark Printer Jetprinter 3200, Jetprinter 5000, Jetprinter 5700, Jetprinter 5770, Jetprinter 7000, Jetprinter 7000v, Jetprinter 7200, Jetprinter 7200V, Optra Color 40, Optra Color 45, Optra Color 45n, X125, X4250, X4270, X63, X73, X83, X85, Z11, Z31, Z42, Z43, Z45, Z45se, Z51, Z52, Z53, Z54 ... 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).