What is the job of prison coil?

It belongs to manual processing. Prison labor is almost entirely light industry or manual processing. Moreover, it is mainly based on pure manual processing such as bean sorting, snow sliver sorting, carton pasting, coil winding and toy assembly. And assembly line operations such as sewing machines, which are the mainstream of prison labor at present. The characteristic of this kind of labor is that both men and women are capable and there is no danger.