Compatible IMINK34 or 4135554X Replacement Cartridge for Hasler IM330, IM350, IM420, IM440, IM460, IM480 Mailing Machines - Blue Frog Supply Exclusive Blue Frog Supply Exclusive Red ink postal cartridge exceed USPS requirements for fluorescence For use in the following printers: Hasler IM-440, IM-330, IM-480, IM-420, IM-460, IM-350