The line butter "Line Dedicated Conditioner" is a next-generation conditioner that achieves both improved line performance and protection.It can be used for various lines such as nylon, fluoro, PE, etc.It smoothes the surface of the line, improves the flight distance performance during casting, and at the same time prevents thread twist and thread knot and prevents line trouble.It also prevents line damage from UV. How to use : When winding the line on the spool, spray it on the line.