Threads used for line engraving: there are PDO threads, PCL thread, we commonly use PDO threads.

In theory, there are only two types of threads: one is toothed, the other is smooth, and smooth lines without teeth are further divided into: spiral, multiple, long and short, thick and thin, and so on.

The reason why so many threads are designed is because each thread acts on different parts and can achieve different effects.

Regarding the shape of the threads, because the design of the threads carving directly determines the lifting effect, this varies from person to person, depending on the specific problems to be solved. Everyone's facial sagging problem is different.