Thank you for viewing. This is a Seikado calligraphy brush, Seika, size 4. Hair diameter: 11mm, Hair length: 55mm, Total length: 265mm I am not an expert in calligraphy, so I cannot explain the details of the brush, but I have included information about Seika from the Houchikudo website for reference. However, this is not a guarantee of the brush's description for this listing. From the Houchikudo website: Seika A mixed-hair brush made with wool and white horse hair. It can express flexible and rich lines, and the use of horse hair makes it a brush that is easy to handle with firmness. This brush is suitable for running script and cursive script for writing two lines on a large sheet of paper. The brush tip has ink on it, and there is some dirt on the shaft, so it appears to have been used. However, as a layman, I don't feel much sign of use on the brush tip. (See photos) This item has been stored at home. There is no cap for the brush tip. Thank you.