Shodo/Shuji Supplies... Others This is a new item. Two small Two large A set of 4. *Extra-large sets are listed separately. These are brush caps for calligraphy brushes. I believe that the standard school calligraphy sets can generally accommodate both large and small sizes. Large: Inner diameter 14mm Small: Inner diameter 9.0mm By putting these on the brushes after use, you can store them without making a mess, and they will be ready to use without drying out for about a week. Made of plastic