These 100% silk embroidery products are done by people with over 30 years of experience. They spend their whole life doing it, that's why they excel. You wont't be able to find where the thread starts where it ends.
Fun fact, the people who make these embroidery products don't do any house work, because silk are too delicate, they can not make their hands rough at all when working with silk.
Silk embroidery is classified as Chinese intangible cultural heritage products.