Lift Cord is made from Polyester fiber - resists effects of sunlight better than nylons and mono-filaments. Small diameter makes it inconspicuous. 1.4 mm has 90 lb tensile strength, 100 yard roll All cords are braided to minimize stretch and reduce friction. You may also use this cord for sewing micro welt cord when sewing window treatments. Sewing Roman Shades? Sewing support, 20 years hands-on experience.