After the recent unveiling and success of their extended itf and Gemstone ink collections, MONTEVERDE USA is proud to announce their new 12 piece ink cartridge sets, now available in 31 brilliant fountain pen ink colors. Each set of cartridges are standard international size and are individually packaged in a slim, hang-able, and reusable plastic container. Perfect for any fountain pen lover on-the-go, you'll always have your favorite MONTEVERDE ink within reach. Each cartridge is made with MONTEVERDE usa's European ink treatment formula (itf) which drastically improves ink-flow, extends cap-off time, and lubricates and protects each pen from corrosion or clogging. Choose from 31 unique color packs or a Mix pack today! the Mix pack comes with the following colors: 2 black Ash, 2 malibu Blue, 1 Blue black, 1 Scotch Brown, 1 Rose Pink, 1 Purple reign, 1 Caribbean Blue, 1 Valentine Red, 1 Emerald Green, and 1 Napa Burgundy