Brand new, unopened Shishodo Calligraphy Brush, Hatsusho Brush 7 Gou Unkaku, White Hair B-53 Retail Price: ¥2,200 Hatsusho Brush, Size 7 With moderate resilience, it's perfect for calligraphy at school. The thickness of the hair is the thickness of the base of the shaft. You can write characters about the same size as the thickness of the hair. Thickness: 21mm