Beautiful vintage pure silk threads of USSR times.
The condition is very good. The thread is strong.
The upper layer of the thread on the bobin is dirty. Remove the top layer before embroidering.
At the plastic bobin about 2000-2500 meters.
Each spool has been used to some degree and so difficult to gauge length.
Thread thickness #40
Remember - silk begins to shine even more if you iron the finished embroidery