4 Bottles 250ml ink refill kit for HP 21/22 27/28 56/57 74/75 60 60XL 61 61XL 901 901XL 564 564XL 920 920XL ink cartridge ND Brand high quality ink for HP ink cartridge Shelf Life: 3 Years Stability: No setting in 3 years (at normal storage) Temperature: -15C no frozen and 70C no gelling Lightfastness: 5-6 BWS; Waterfastness: 3 (Average); Gasfastness: 4 (Good).