What is the difference in structure between acupuncture needles used in modern Chinese medicine and ancient acupuncture needles?

Take Yunlong brand acupuncture needle as an example: modern acupuncture needle is generally composed of needle body, needle tip and needle handle. The front end of the needle body is a needle tip, and the back end is provided with a needle handle. The needle body and needle tip are smooth, and the needle handle is threaded, so it can be inserted and twisted when used. At the same time, compared with ancient times, modern times pay more attention to the experience of acupuncture. For example, Yunlong's silicone oil-coated acupuncture needle greatly reduced the pain caused by acupuncture.