Pro-tie Extra Heavy Duty cable ties are made from high strength and lightweight 6/6 nylon. Nylon 6/6 is a hygroscopic material, which absorbs and releases moisture, is non-toxic and has a working temperature range of -40F to 185F. 175 lbs. tensile strength. Approximately .08 thick and .35 wide. UV Black cable ties are UV stabilized for outdoor use. UL 94 Flammability Class V-2 for use in air handling areas and HVAC duct work. UV black.