Hybrid Dye & Pigment Blank ink. Compares to Collins Ink Complete H TWK-1818. Used for most basic stocks, including uncoated, matte coated and gloss coated. Has good darkness, dries well and has great decap. This cartridge is a remanufactured product of the USA. Used in most envelope/address printers from Pitney Bowes, Buskro, Secap, Astro, Asmarc, FP Mailing Solutions, Kirk-Rudy and MCS.