Writing method:
Hold the pen right and use force in the middle of the pen
(If you force the left or right corner of the tip, it is not easy to effluent, too much force will scratch the paper)
The pen and the writing platform should maintain a certain angle. If the verticality is too large, it is not easy to effluent.

The width of the writing head is:
2MM, 3MM, 4MM, 5MM, 7MM, 9MM, 11MM