Ironically, other flushes on the market are “toxic” to the various internal seals and gaskets inside of fountain pens, making them brittle and dry. This eventually leads to catastrophic damage and expensive repairs. <br><br> I formulated this system to not only safely clean dried ink and grime, but to take it one step further and recondition and hydrate the seals and plastic components as well! <br><br> This makes it the only pen flush on the market that actually leaves your pen in better condition after using it than it was prior! <br><br> The kit includes a uniquely shaped 50ml tube that allows you to safely flush your pen without damaging your nib. <br><br> Because it is highly concentrated and you only need to mix a drop or two with water each time, one bottle lasts over 100 uses!