EF0.3-0.4mm (0.38mm), F0.45-0.55mm (0.5mm), M0.7mm or so, b 0.9-1.1mm;
EF nib in China is generally marked with the words "extra fine" and "special for accounting", while M nib and B nib can be considered as special pens for writing and signature, which are not suitable for general writing. We usually write with a 0.5mm pen.
There are many kinds and models of pens. According to the composition of the nib, it can be divided into gold pen and iridium pen. The tip of the gold pen is made of gold alloy, which is soft, elastic and comfortable.
However, the gold pen is expensive, soft and difficult to master, so it is not recommended for beginners. Iridium pen tip does not contain gold, and some pen tips are gold-plated. The pen tip is hard and cost-effective, so it is a tool suitable for beginners to write.
Gold nib and iridium nib are more durable than nib, and the secret lies in the small round particles on nib. This small round particle is made of iridium ruthenium alloy, which is very hard and wear-resistant.
If you put the gold nib and the steel nib on the grindstone at the same time, after one hour, the gold nib will wear only 0.07 mm, while the steel nib will wear as much as 5 mm.
Although the price difference between gold pen and iridium pen is great, they both belong to metal alloy, but the polishing method and color are different. So in a sense, they are the same. In terms of cost performance, iridium pen is a good choice.
Extended data:
The nib is the core of a pen. The structure of the nib is divided into dark tip, semi-bright tip and bright tip. The sharp tip is the structure where most of the nib is exposed outside the nib, and it is also the presentation form of most pens.
Sufficient elasticity, smooth writing. Another point is that it is easy to replace. Dark tip means that most of the pen tip is in the pen tip, and only a small part is exposed.
This kind of pen can be made into rules first and then into circles, which is easy to lay the foundation and suitable for beginners. Semi-tip refers to a kind of pen tip between sharp point and dark point, which takes into account the advantages of sharp point and dark point, and inherits the disadvantages of both, so it is moderate.
Usually, pens are made of three materials: steel nib, iridium nib and gold nib. Among them, the pen tip is made of ordinary steel alloy, which is not suitable for writing, and it is easy to wear and has poor elasticity, which greatly affects the writing effect.
So it's almost eliminated. Because of its hardness and wear resistance, iridium nib has replaced ordinary steel alloy nib and become the mainstream of the market.
Gold nib is usually made of K gold, which can be divided into 14K, 18K, 2 1K and 24K according to the content of pure gold. Because pure gold is soft, the higher the gold content, the softer the nib, and the longer the oxidation and corrosion resistance.