InkOwl Bulk Compatible Ink for HP #72 cartridges (6x250mL) This ink formulation is designed to be equivalent to the original HP #72 ink set High-fidelity reproduction of original colors and color gamut with no ICC profiling required. No need to purge the lines of old ink when switching to this ink Ink kit includes: 6x250ml bottles InkOwl fade resistant inks for HP #72 (pigment-based matte black, dye-based photo black, cyan, magenta, yellow, and gray) - equivalent of 1.9 sets of original cartridges NOTE: Refilling original HP #72 cartridges is not recommended. Instead, you should get a set of "refillable cartridges" in order to use this ink. These special funnel-fillable cartridges can be found on Amazon and will greatly simplify the refill process. This is a stable and proven formulation manufactured in the USA. This is not a cheap Chinese ink! Ordering an InkOwl product ensures that you will get a consistent result with each batch of ink you order.