Retro small calligraphy brushes, made by Gyokushodo, 6 brushes, for calligraphy practice. Manyo-gana brush, made by Gyokushodo, 1500 yen, 5 brushes. Omichi, made by Gyokushodo, 1500 yen, 1 brush. Although unused, these are old items, so please understand that there may be some deterioration. The diameter is about 5mm, so I think it's a size 10.