You won't receive any pen, just the ink cartridges This auction for 100 ink cartridges allows you to select the colors Your choices are: black, blue , green, pink, purple , turquoise, light orange, brown and red ) Any color combination is fine. It can be just one color or as many as you'd like. It's totally up to you. Please specify the color(s) via eBay message box If not, I'll email you for selection before shipping. (Their shelf life is up to three years) Would you like to make them last a lot longer? Please read the article below. They are standard , international size ink cartridges and they'll definitely fit your KAWECO pen. Any KAWECO fountain pen model. The ink is both acid free and archival safe It dries quickly and doesn't smear when gotten wet It is non toxic and pH neutral Lightfast and waterbased it won't damage your pen under any circumstances. FREE SHIPPING Please allow 10-12 days for the delivery. Tracking number uploaded in 1-2 days I hope it's not too long to wait for great ink cartridges Satisfaction guaranteed Not happy , please return them for a full refund. No Questions Asked ____________________________________ Below is some interesting information about ink cartridges in general (their longevity) Inks are water solutions and cartridges are made of what seems to be polyethylene. Over a period of years, water molecules will migrate through the walls of the cartridge-- it has nothing to do with whether the cartridge is sealed properly or not it will happen anyway. This situation is roughly analogous to a balloon filled with air. After several days, air leaks through the rubber, no matter how well it is sealed. The bottom line is that cartridges have a shelf-life on the order of years. They should be fine for about 3 years or so at room temperature. They can last much longer at lower temperatures, but don't allow them to freeze--the water will expand and possibly break the cartridge. In theory, a way to make cartridges last *almost* indefinitely, would be to store them in a jar filled with water. This would *essentially* keep the water inside the cartridge in equilibrium with the water outside--i.e. about as much water would leak in as would leak out. The reason that I said *almost* is that there is a very weak force of osmosis at work. This is because there is a difference in the concentration of molecules dissolved inside the cartridge (i.e. the ink and small amounts of other additives) and outside, where there is nothing dissolved). This force will very slowly pull water into the cartridge as the exact concentrations attempt to reach equilibrium (this is the principal of dialysis). However, we are now talking about a process that would take perhaps decades. Also in theory, if the water in the bottle had the exact concentration of large molecules as inside the cartridge, the cartridge would last more than a lifetime.