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What does a pen without a head mean? Want a photo! ! ! !
Baotou is a small nib, and the one without Baotou is the one with a large nib width. Just pull out the nib. The small nib is cylindrical and the big nib is not closed.

The nib, which can be said to be the most critical part of the pen, varies in thickness. Generally speaking, the most common pen tip sizes are "B (wide), M (medium), FM (thin-medium), F (thin) and EF (extra thin)".

From coarse to fine, it is B > M>F & gtEF, and there will be some differences in the specifications of each pen manufacturer. Under the same size unit, the Japanese pen will be thinner than the European pen.

According to the usual writing habits, westerners usually use the M-tip as the main pen and choose the B-tip when signing. Due to the complexity of Chinese writing strokes, F or thinner EF pen tips can generally be used.

Extended data:

There are many kinds and models of pens. According to the composition of the nib, it can be divided into three types: gold pen, iridium pen and ink bag pen.

1, fountain pen:

The nib is made of gold alloy, which is soft, elastic and comfortable. But the gold pen is expensive, soft and difficult to master, so it is not suitable for beginners.

2. Iridium pen:

The nib does not contain gold, and it is partially gilded. The nib is hard, but it is cheap and good. It is a tool suitable for beginners to write.

The reason why gold nib and iridium nib are more durable than pen nib 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. According to the experiment of Shanghai Jinxing Golden Pen Factory, if the pen tip and the pen tip are placed on the oilstone at the same time, after one hour, the wear of the pen tip is only 0.07 mm, while the wear of the pen tip is as high as 5 mm.

The reason why the smoothness is so different is that the polishing method and fineness are different. So in a sense, the gold pen and the iridium pen are the same. But the material and feel are different, which leads to the price gap.

3, ink bag pen:

The ink bag pen does not need to absorb ink, but it can be used by inserting a special ink bag.

References:

Baidu encyclopedia-pen