筆 from 攀桂堂 Hankeido

HANKEIDO is a unique workshop in the world that exclusively carries on the ancient craft of making "Maki Fude (written as 巻筆）" that have been handed down through generations, preserving the tradition and demonstrating exceptional Shokunin spirit. Here, brushes known as "MAKI FUDE (巻筆)" , also called "Yūshinfude" (written as 有芯筆), are meticulously crafted .
"Yūshin-fude refers to a type of brush pen where hairs are wrapped with Japanese WASHI paper around a core and then topped with additional hairs.
All 18 types of the oldest brushes preserved in the Shōsōin (Imperial Repository) from the eighth-century Heian period in Japan are of the yūshin-fude type, and they represent the most ancient form of brushes that still exist today.