PDO Threads come in many different forms mono, screw and cog threads they are used for different things throughout the body depending on what you are hoping to achieve the most common thread we use in the Honey Derma PDO 3D Cogs which have multidirectional barbs that fix and support the skin tissue in various directions and are excellent for non-surgical thread face lift treatments. This minimally invasive procedure uses dissolvable PDO (Polydioxanone) Cog threads to lift and tighten the skin by stimulating new collagen production thereby reducing wrinkles, tightening pores and creating volume.