Low refraction index (1.37) fl uorocarbon very close to light refraction index (1.33) so virtually invisible, it is made in the most used gauges for using big leader in drifting fi shing, in big game and vertical jigging and tropical spinning. In hanks to keep unchanged mechanic features. So malleable that it’s easy to make also complicated knots without sliding. High breaking charge in relation to diameter and it is very resistant to abrasion.