Oil paint brushes have a history of more than half a century in the West. The most stable raw material for pen-making is animal hair, which is divided into soft bristles and hard bristles.
The material of the hard bristle pen is relatively single, which is the bristles of domestic pigs. This kind of pen is generally used to draw thicker parts and has a hardness, so it is capable of fast and large-scale coloring.
Soft bristle pens generally use ferret hair, that is, ferret hair, and the size of the pen is relatively small. This kind of pen is made with great care and occupies an important position in the history of Western oil painting. It is responsible for drawing all the delicate and subtle things. Ferret brushes are usually made with ferret tails. They are divided into tail-tip brushes and mid-tail brushes for different purposes. In addition to ferret hair, squirrel hair is also used as a pen, but squirrel hair is softer than ferret hair and its strength is weaker.
In addition to these traditional materials, nylon pens are also popular now, with low prices and good flexibility.