Our Ironwire Spectra Fusion is the strongest and most versatile cord we make and has been redesigned from the ground up. It features a hybrid blend of Spectra and Polyester for its jacket and 100% Spectra for its braided core. This hybrid construction takes advantage of both fibers resulting in a cord that has great UV resistance, wont freeze, is knotable, extremely strong, very abrasion resistant, very cut resistant, and has very low stretch. If NASA was going to the moon tomorrow and needed to outfit the Astronauts with a hank of cord, this is what they would give them. Like all of our products, this is manufactured in house on our braiding machines using the best materials on earth. Diameter: 3mm (1/8"), Weight: 3.50oz per 50', Break Strength: 1,500lbs. Made In USA.