Pen barrel is natural bamboo.
Nib is wolf hair and wool.
This Chinese brush has three sizes: small, medium and large.
The Small hair length: 4.2 cm | 1.65 inch
The Small pen length: 21.8 cm | 8.58 inch
The Medium hair length: 3.3 cm | 1.29 inch
The Medium pen length: 21 cm | 8.26 inch
The Large hair length: 2.7 cm | 1.8 inch
The Large pen length: 20.2 cm | 8.9 inch