Digital source (retrieved 30th March 2016).
Digital source of illustration (retrieved 8th July 2016).
GVE
Koma is a Japanese term for a square, wooden spool used to tension metal threads while making various forms of Japanese embroidery. The metal thread is wrapped around the middle of the spool. They are also sometimes used for floss silk threads that are wrapped around the middle of the spool.
Digital source (retrieved 30th March 2016).
Digital source of illustration (retrieved 8th July 2016).
GVE