This is a PDO(Polydioxanone) thread for face lifting. It puts in skin and lifts skin's wrinkles, sagged parts and generates collagen. So, it has many effects, for examples, removing wrikles, maintaining skin's elasticity and generating collagen. It's non-plasitc surgery, so has few side effects. Therefore, it can be said very safe. We can provide Mono, Screw, Twin, Twin Screw and Cog thread. If you want another models, we can also provide it. We have many certificates, which are, KFDA, GMP, CE and ISO 13485, so our products' quality is very high.