PDA Cara SCREW Thread. In the packaging of this product we can find 20 pieces of thread, which are made with great care in cooperation of factories of Korean, Japanese and German origin. Thanks to the mix of specialists working on these threads, we finally get the highest quality product. The Thread type is a single thread that is helically wound around a needle. This design allows the needle with the thread to thread into the tissue, resembling a screwing screw in a very vivid way. Thanks to this, we can achieve the effect of raising the skin and subcutaneous tissue, which increases collagen production.