Wool loops should be carefully selected and matched according to different producing areas, seasons, ages, grades, thickness, softness and length of sharp edges of different parts of sheep. Nowadays, many people call a pen with a long hair a long front pen, but in fact, a pen with a long side is a long front pen (also called a deep front pen). Primary school calligraphy level 4 can be written in sheep hair.
trait
main points
When you collect the pen, both ends should be sharp. The pen tip is easy to write and express. Writers often refer to their pens as "bald pens", but if they are not sharp, they will become bald pens, and there will be no spirit in writing books.
When buying a new pen, the hair is glued and polymerized, which is easy to distinguish. When checking the old pen, first wet the pen and gather the hair, then you can distinguish the sharp baldness.