The purpose and role of the monofilament fishing line in the speargun is not only to connect and hold the shaft with the gun, but also to contribute greatly to the smoothness and correction of the course of the shaft.
 
For this reason, the line must have the appropriate flexibility and elasticity but at the same time durability and resistance to use without major changes in its technical characteristics and behavior when exposed to hot / cold water environment.
 
The line that responds and offers all this is called Flex pro.
 
In 100mt spool, 4 colors and 2 diameters: 1.6 mm & 1.8 mm.