Why do you want to fish with a string?

The purpose of fishing the sub-line is to prevent the main line from breaking unnecessarily when hanging the bottom or catching big fish (for example, the main line is 1.0, and the sub-line can be 0.6 or smaller, so that the fishing group will break the sub-line due to excessive tension to protect the main line and its accessories).

The secondary line, also called foot line, brain line or mouth line, is a fishing line (sometimes called hand line group) connecting the main line and the hook in fishing tackle. The number of sub-lines used is usually smaller than the main line (that is, the Taoist system), which is generally 0.4-0.8 times that of the main line. Sub-wires and main wires have different quality requirements, and sub-wires are generally more resistant to curling and softer.