1-Case (24) High Definition Versatile Black Ink Cartridges offer high resolution, crisp images, on porous and coated materials when used with a heater/dryer. This ink is excellent for high quality mailings on almost any address printer or addressing system such as Rena, Secap, Astro, Hasler, Neopost, FP, Bryce or Kirk Rudy. Unlike HP® Standard Versatile Black, this ink produces a much richer print. MRH105 compares to Collins CM 902.