PDO Cara SCREW Thread. In the packaging of this product, we can find 20 pieces of threads that are made with great care in cooperation with plants of Korean, Japanese and German origin. Thanks to the mixture of specialists working on these threads, we finally get the highest quality product. The Thread Type screw is a single thread that is twisted around the needle in a spiral. Such a structure allows the needle with the thread to thread into the tissue, resembling a very vividly screwing in a screw. Thanks to this, we can obtain the effect of lifting the skin and subcutaneous tissue, thanks to which the production of collagen increases.