The Power Pro Spectra Braided 40LB 150YDS in Green is the most technologically advanced and premier micro braid fishing line available. 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. This Spectra has a specific gravity of 0. 98 g/cc ???? just a hair lighter than water. It has been specially designed to ensure near zero stretch, resulting in the ultimate in sensitivity and hook setting power. PowerPro outperforms monofilament lines in any situation and leaves other superlines in the dust.