Product Name: Calligraphy Brush, Kumano Brush, K89, Mai; Size: Head Length: 1.1 inches (28 mm), Diameter: 0.3 inches (7 mm), Total Length: 8.7 inches (220 mm); Material: Weasel Hair [Features] Only uses weasel tail hair. The waist is slightly strong and elastic. This brush is useful because it has a thin tip and has a good cohesion.