Berkley Trilene 100% Fluorocarbon Fishing Line - Choice of the pros for nearly 10 years! Trilene 100% Fluorocarbon is the “XT” of professional-grade fluorocarbons. This proven formula provides incredible shock strength, abrasion resistance, and knot strength. Fast-sinking with greater line density for high sensitivity and less “bow” in the water - all advantages for feeling the bite, setting the hook, and landing more fish! The choice of the pros! A fluorocarbon good enough to be called Trilene Nearly Invisible - Similar refractive index to water so fish can't see it Optimal impact strength - Proprietary 100% PVDF formula specially processed for optimal impact strength Excellent Manageability - Lower memory for superior casting