The ballpoint refills and signature refills we use are straight, which is common sense - but you know, there is no one who specifically stipulates that the refills have to be made in that shape. Thus, Han Chi-hoon, a Korean designer who flashed a certain day, brought this spiral-shaped refill T&T Pen-ink Chamber:
The idea is actually very simple, changing the refill from the original straight to the spiral, without changing the length of the ballpoint pen (the signature pen) itself, can provide almost twice the amount of ink stored. However, considering that some people write very hard to press the tip of the pen, after changing to a spiral shape, the refill may not be able to withstand the pressure, so it is estimated to use a harder plastic?
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