Yo-Zuri Fluorocarbon does what a good fluorocarbon does and that is disappear under water. The reason for using fluorocarbon leaders is so that the fish don't get spooked by the leader. This is especially true of cautious species. Yo-Zuri pioneered the use of fluorocarbon. The pink color masks any nicks the line may get over time, preserving its invisibility for longer than clear fluorocarbon.
Yo-Zuri Fluorocarbon is great for making fishing leaders. Available in several lb tests.