backflow preventer / pen

Have you ever met with a situation that the ink flows backwards to your hand? Using the brush filled with ink, our hands will be stained easily with ink flowing down from the tip of brush, which not only makes us annoyed but also dirty our painting.
What a pity! But don't worry! An original design is born! We make a small change between the tip of the brush and its handle. This structure keeps the backflow ink in the concave with an angle of 15 degree, so the ink would not flow down to your hand. But after the handle stands up, the ink will flow naturally which ensure us neat and tidy when we paint.