Mi Zige, how many years have you been learning Chinese calligraphy?

Beginners can use 10 cm or less, depending on how big you want to write and how big the brush is. For example, if you want to practice calligraphy, you can write one word for every four Mi Zige, and you are holding an oversized brush, so I'm afraid it's a little wasteful to buy Mi Zige. For example, if you want to write words with a size of 5 cm, use an ordinary brush, and a Mi Zige of about 6 cm is appropriate.