ND@ 4x4oz ink refill kit for HP 901 901XL cartridge Officejet J4624, J4660, J4680, J4680C printers 4x4oz ND Brand premium water-based dye ink for HP 901 901XL ink cartridge Easy refilling! Big saving! 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).