Achieved further evolution and become the core of all assist systems.The straight line strength is increased by knitting four super strong Izanus yarns.This not only improves the strength of the neck wrapping part, but also makes it possible to slim the neck wrapping part by applying tension so that the underwater resistance can be reduced.In addition, it has excellent wear resistance compared to conventional products, and it does not fluff easily and improves breaking strength, so it is not only for slow pitches that require delicate adjustment but also for big games such as tuna that requires strength. It is a usable assist tool.