PowerPro Braided Spectra Fiber Line is not affected by saltwater, UV rays, or most chemicals and solvents. The life of PowerPro line is much longer than monofilament lines (as a rule of thumb, it lasts five times the life of monofilament line). In fact, depending on how much and where you fish, PowerPro Braided Spectra Fiber Line could last two to three fishing seasons or longer. With PowerPro, you have more fish in the boat, and less bait lost youll find that youre actually money ahead. PowerPro Braided Spectra Fiber Line is composed of polyethylene, a very slick plastic. In fact, the only material that is slicker than Spectra, is Teflon. Spectra, combined with PowerPro's Enhanced Body Technology, makes a rounder and smoother line, which is gentler on rod guides than the older style braids. PowerPro Braided Spectra Fiber Line has a specific gravity of 0.98 g/cc just a hair lighter than water. Unlike heavier nylon and Dacron lines that sink, PowerPro will tend to stay at the surface. This means that youll get faster control of your fish after a strike with less belly in the line.