1. The pen tip width is different. The width of EF nib is about .24 mm-.28 mm. F The width of the pen tip is about .28mm-.34mm.
2. Different fonts are suitable for writing. EF is suitable for writing fine fonts because of its small nib. F pen tip is the thickness of daily use.
3. The thickness of the pen tip is different. F-tip is thin, ef is extra thin.
The pen tip is the most critical part of a pen, and it varies from fine to thick. Generally, the most common pen tip sizes are "B(Broad), M(Medium), FM(Fine-Medium), F(Fine) and EF(Extra-Fine)".
classification:
There are many kinds and models of pens. According to the composition of pen tip, it can be divided into gold pen and iridium pen. Gold pen, the nib is made of gold alloy, the nib is soft, elastic and comfortable. However, the gold pen is expensive, soft and difficult to master, so it is not suitable for beginners to use.
Iridium pen, the tip of which does not contain gold, is partially gilded, and the tip is hard, but it is inexpensive, so it is a suitable tool for beginners to write. The reason why the gold nib and iridium nib are more durable than the pen nib is that the secret lies in the small round particles on the pen nib. This small round particle is made of iridium-ruthenium alloy, which is very hard and wear-resistant.
above content reference: Baidu Encyclopedia-Pen Tip