Intraline Mono M2750 filaments used to create PDO threads are made of polydioxanone, which is one of the safest materials. Mono threads are smooth without barbs and are anchored to a point on the face or the scalp. They mainly tighten the skin and provide a small amount of liftSmooth in texture, half-folded form with ultra-thin sharp needles, provides the most natural and outstanding results. Lifting and realigning dermal tissue that has sagged or is drooping.