Everyone in the study of hard pen, you need to understand the knowledge of the pen pen factory, the ball point pen is one of them, this paper to learn hard pen students share the ball pen on the structure of the classification of knowledge.
A disposable pen, pen refill is, neither gas nor change ink cartridge, ink runs out, can only be discarded.
It can change the ball pens, ballpoint pen factory function button, spring, lock, restoration ballpoint pen manufacturers.
The pen holder can be rotated to extend or retract into the cartridge.
We have combined the ballpoint pen, a ball pen and pencil combination, ballpoint pen and the test pencil combination, a new pen pen and small bulb combination etc..