The “screw” part of the name describes the fact that the thread is thicker and spirally or twisted within the needle, which is said to offer a more efficient lifting effect than conventional monofilament threads (mono-threads). The threads not only tighten the skin, especially on the face, neck, and décolleté, but also stimulate collagen production in the tissue, leading to increased volume. Because the spiral threads are flexible and move with the face, the results appear natural and lifelike, not artificial.
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