This leader is made of 100% fluorocarbon with a refractive index that's almost identical to that of water. The result is it's virtually invisible to fish. Along with eluding the eyes of prey, this leader is highly abrasion resistant, has a low stretch factor and has UV protectors of extended life. Tie a section between your line and bait you'll notice a higher percentage of hook-ups. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Leaders.