Our compatible fast dry black and spot color inkjet inks are housed within a remanufactured, 45a, HP ink cartridge and have been designed for high-speed, high-volume mail addressing systems utilizing HP thermal ink technology. Although it would be impossible to list all of the HP thermal inkjet, direct mail equipment that this ink works well on, a partial list might include mailroom equipment such as: Astro Machine - Bryce to 27K, some Buskro, DataTech, Hasler, Kirk Rudy, MCS 600, Neopost, Rena and Secap. (Additionally, HP deskjet ink customers like our color printing ink, as do HP designjet ink customers). Extensive testing has proven that these fast dry inks offer superior performance on more types of paper with darker, sharper, and crisper mail addressing and barcode printing. These inks are, primarily, used on porous and coated stocks, excluding aqueous stock. It is highly suggested that when cleaning cartridge heads, a lint free cloth and alcohol be used. Using paper towels is strictly prohibited - as lint will clog the cartridge head and void any and all warranties. Shop our online store for spectacular savings on remanufactured HP fast dry ink, HP thermal inkjet ink cartridges with free delivery on every order.